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

Mandy got a $240 discount.
If you set up the equation it will be
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.