หนังสือเล่มหนึ่งคนขายติดราคาไว้โดยราคานี้คนขายได้กำไรอยู่แล้ว 20% ต่อมามีคนมาขอซื้อโดย
ขอลดราคาลง 10% จากราคาืที่ติดไว้ คนขายก็ยอมขายแต่โดยดี สรุปแล้วขายได้กำไรกี่เปอร์เซนต์

เฉลย >> 8% ครับ โดยมีวิธีการคิดดังนี้
ก่อนอื่นเราสมมติให้หนังสือเล่มนั้นมีต้นทุนราคา  x  บาท
คนขายติดราคาไว้โดยราคานี้ได้กำไร 20% ใช้การเทียบบัญญัติไตรยางศ์
หนังสือต้นทุนราคา 100 บาท ขายในราคา 120 บาท
หนังสือต้นทุนราคา    1   บาท ขายในราคา 120 / 100 บาท
หนังสือต้นทุนราคา    x    บาท ขายในราคา  ( x ) × (120 / 100) บาท
แสดงว่าคนขายได้ติดราคาไว้ ( x ) × (120 / 100) บาท

ต่อมามีคนมาขอซื้อโดยขอลดราคาลง 10% จากราคาป้ายที่ติดไว้
ใช้การเทียบบัญญัติไตรยางศ์เช่นเดิมครับ
หนังสือติดป้ายราคา 100 บาท ขายในราคา 90 บาท
หนังสือติดป้ายราคา    1   บาท ขายในราคา 90 / 100 บาท
หนังสือติดป้ายราคา    ( x ) × (120 / 100)    บาท ขายในราคา  ( x ) × (120 / 100) × (90 / 100) บาท

ถ้าเราคิดเป็นทศนิยมจะได้ว่า
คนขายได้ติดราคาไว้บนป้าย ( x ) × (120 / 100) บาท เท่ากับ 1.2x บาท
คนซื้อได้ซื้อไปในราคา ( x ) × (120 / 100) × (90 / 100) เท่ากับ 1.08x บาท
ก็ใช้การเทียบบัญญัติไตรยางศ์เช่นเคยครับเพื่อหาว่าได้กำไรกี่เปอร์เซนต์

หนังสือต้นทุนราคา    x   บาท ขายไปในราคา  1.08x บาท
หนังสือต้นทุนราคา    1   บาท ขายไปในราคา  1.08x / ( x ) บาท
หยังสือต้นทุนราคา 100 บาท ขายไปในราคา  1.08x / ( x ) × 100 = 1.08x / ( x ) × 100 = 108 บาท

สรุปแล้วคนขายได้กำไร 8% ครับ

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