simple equation

🎓 學業台小學及中學教育

[匿名]

2007-04-13 11:10 pm

(1) if the apple is $20 of,what is the orginal price of the apple ?
(the apple is 10% off)

回答 (3)

用戶123346

2007-04-13 11:15 pm

✔ 最佳答案

20 x (1+20%)

=20 x (120/100)

=20 x 1.2

=$24

The apple's original price is $24.

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chocoa

2007-04-14 12:57 am

let $Y be the original price of the apple

(1-10%)Y=20
90%Y=20
Y=20/0.9
Y= 22.2...

.`. the original price of the apple is about $22

參考: me

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dom123

2007-04-14 12:41 am

let x be the original price
x*(1-10%)=20
x = 20/90%
x =$22.2 (corr.to 3sig.fig.)

參考: Me

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