Question

the price of a computer after discount was 1,200 if the doscount was 20% how much discount does mandy get ??

Answer 1

1200= 80%  
?       =100%

to find the ?  you can multiply 100(1200)=120000
then 120000 divided by 80= 1500
 the original price was 1500, with the discount of  20%   you save 300$   and the price is 1200$

Answer 2

Mandy got a $240 discount.
If you set up the equation it will be $\frac{x}{1200}= \frac{20}{100}$
Now to find out what x equals you have to cross multiply. So x times 100 equals 100x. And 1200 times 20 equals 24000. 100x=24000
Divide both sides by 100 and you get x=240. So 240 is your discount.