61 หน่วยที่ ๖ ร้อยละ ฝ.๖.๑๖/ผ.๑๖ สถาบันส่งเสริมการสอนวิทยาศาสตร์และเทคโนโลยี (สสวท.) 2. หาคำตอบ 1) ซื้อกางเกงมาตัวหนึ่ง ได้รับส่วนลด 15% ซึ่งคิดเป็นเงิน 195 บาท กางเกงตัวนี้ ติดราคาไว้เท่าใด วิธีทำ ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. 2) จุ๋มติดราคาขายผ้าม่าน 4,280 บาท ประกาศลดราคา 25% จุ๋มขายผ้าม่านราคา เท่าใด วิธีทำ ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. .............................................................................................................................
62 หน่วยที่ ๖ ร้อยละ ฝ.๖.๑๗/ผ.๑๗ สถาบันส่งเสริมการสอนวิทยาศาสตร์และเทคโนโลยี (สสวท.) แสดงวิธีทำและหาคำตอบ 1. เปาลงทุนท�ำเสื้อยืดตัวละ 120 บาท ขายไปตัวละ 150 บาท เปาได้ก�ำไรร้อยละเท่าไร วิธีทำ ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. แบบฝึกหัด 6.17
63 หน่วยที่ ๖ ร้อยละ ฝ.๖.๑๗/ผ.๑๗ สถาบันส่งเสริมการสอนวิทยาศาสตร์และเทคโนโลยี (สสวท.) 2. ร้านค้าสองร้านขายเครื่องซักผ้าชนิดและขนาดเดียวกัน ร้านแสนดี ขายราคา 9,400 บาท และลดราคาให้ 5% ร้านดีงาม ขายราคา 10,000 บาท และลดราคาให้ 12% ร้านไหนขายถูกกว่า และถูกกว่ากันเท่าไร วิธีทำ ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. .............................................................................................................................
64 หน่วยที่ ๖ ร้อยละ ฝ.๖.๑๗/ผ.๑๗ สถาบันส่งเสริมการสอนวิทยาศาสตร์และเทคโนโลยี (สสวท.) 3. มีร้านขายเสื้อสองร้าน ขายเสื้อแบบเดียวกัน คุณภาพเท่ากัน ร้านพลอย ซื้อเสื้อมา 250 บาท และตั้งราคาขายให้ได้ก�ำไร 12% ร้านแพรว ซื้อเสื้อมา 200 บาท และตั้งราคาขายให้ได้ก�ำไร 35% ใครขายแพงกว่ากัน และแพงกว่ากันกี่บาท วิธีทำ ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. ............................................................................................................................. .............................................................................................................................