價格----應用題

設這手提標價為x元
來價就係0.6x
(新值-舊值)/舊值乘100%就是該手提電話的標價比來價高百分之幾?
x-0.6x
--------- x 100%
0.6x
5/3-1
= ------- x100%
1
=66.67%

設手提電話的標價為$y

手提電話的來價 = 手提電話的售價 = y * 60%

所以, 手提電話的標價比來價高:

( y - y * 60% )
--------------------- * 100%
　　y * 60%

　( 1 - 0.6 )
=--------------- * 100%
　　0.6
　0.4
=------- * 100%
　0.6
　　2
=66----%
　　3

100-60=40%
高40 %

60%X=Y

X/Y x100%=60%

let the selling price be Y
let the original price be Z

0.6Y=Z

The ratio of selling price to original price:
= Y / Z
=Y / 0.6Y
=1.66667


therefore, the selling price is higher than the original price by 67%

x = 標價
y = 來價相同
0.6 x = y
x = 1.67 y
標價比來價高 67%

100%-60%=40%

1.66666666