Jason bought a computer for$1,800.It was on sale for 20% off. What was the original price?

Answer 1

You need to use ratios for this type of question. If 80% of the original price (20% off) is $1,800 what is 100% of the original price?

80 : 1,800  as  100 : x

Turn the ratios into fractions and solve for x:

⁸⁰/_1,800 = ¹⁰⁰/_x  

80x  =  180,000

x  =  2,250

The original price was $2,250