Question

The price of an item has been reduced by 80%. The original price was $45. What is the price of the item now?

Answer 1

%change=100(final-initial)/initial, so we can say:

100(final-45)/45=-80 multiply both sides by 45

100(final-45)=-3600 divide both sides by 100

final-45=-36 add 45 to both sides

final=9

So the price of the item now is $9.