小六MATHS題

Let the cost price be x dollars.

x (1+20%) = 600
x (120%) = 600
x = 600 / 120%
x = 500

Therefore the cost price is $500.

2006-12-15 22:14:06 補充：
既然商店有20% profit,cost 怎會比selling price高?換言之$720一定不是答案.

2006-12-15 22:15:56 補充：
Cost price + profit = selling priceorCost price x (1 + profit %) = selling price

The answer is 500

600 / (1+20%)
= 600 / 1.2
= 500

Cost Price is $500

=600/(1+20%)
=600/120%
=$500

小學都用英文=.=

The cost price is:
600/(1+20%)
=600/120%
=$500

OR

Let the cost price be x./Let x be the cost price.
(1+20%)x=600
120%x=600
x=600/120%
x=500
.:The cost price is$500

The follow up method also can use,you can use equation or the simple's method.
Hope can help you!

x(1+20%)=600
x=500

ｌｅｔ the cost price of the model car　ｉｓ　ｘｄｏｌｌａｒｓ：

　　　　　　　ｘ＊（１＋２０％）＝６００
　　　　　　　　１２０／１００ｘ＝６００
１２０／１００ｘ＊１００／１２０＝６００＊１００／１２０
　　　　　　　　　　　　　　　ｘ＝５００

ｓｏ　the cost price of the model car　ｉｓ５００ｄｏｌｌａｒｓ

Let the cost of model car be $X,
So,
cost + profit = $600
$X + ($X x 20%) = $600
$X x (1.2) = $600
so that,$X = $600 / 1.2=$500
The cost of the model car is $500.!

2006-12-06 17:44:04 補充：
我小學五年級(lv)都識做 ^^"v

$600 x(1 + 20% )
= 600 x 1.2
= $720

the cost price of the model car
=600/(1+20%)
=600/120%
=$500

600*(1-20%)
=600*80%
=$480

2006-12-06 17:43:07 補充：
$500600/(1+20%)=600/120%=600*100/120=$500