中一數學題,,,請入入入入入=]]]]]]]]]]]

2009-11-19 6:06 am
A shopowner sets the marked price of a camera so as to make a profit of 20%.

Finally, he sells it at a discount of 10%and makes a profit of $256.

What is the cost price of the camera?

唔該曬=]
更新1:

最好條式唔係方程啦

回答 (1)

2009-11-20 1:22 am
✔ 最佳答案
marked price 是 cost price 的 120%,

九折後 marked price 是 cost price 的 120% * 90% = 108%

即以 cost price 的 108%出售可賺 $256

cost price = 256 / 8% = 25600/8 =$3200

條式 : $ 256 / (120% * 90% - 100%) = $ 3200



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