Question

What is the original price if there is a 10% discount and the sale price is $76.50

Answer 1

Since there was a 10% discount, you know that 90% of the price is 76.50. So to get 100% of the price (the orginal price), you divide 76.50 by .9.

Answer 2

make a proportion:
90% - 76.50$
original price is 100% - x$

x=76.50$*100%/90%=85$
Answer: original price is 85$