Question

A jacket is on sale for 40% off .The sale price is $90.00.What is the original amount of the jacket

Answer 1

Set up a proportion
90/x = 60/100
60x = 9000
x = 150

if you're wondering why I used 60 instead of 40 in the proportion it is because $90 is 60% of the original price, not 40%

hope this helps!