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

%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.

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