Original pair of shoes is $42.the sale price is 20% off the original price. what is the amount off

the end of th question iswhat is the amount off the original price I need to see the work

Um I'll give you help but you try to find the answer using the calculator. I had this kind of problem for HW today :) ok, so your original price wont stay the same because your using a coupoun off? So, turn 20 -/- into a deciamal. 0.2. Then do $42 times 0.2 and there you go :)