A store has a 20% off sale on pants. With this discount, the price of one pair of pants before tax is $15.20. What was the original price of the pants?

Answer 1

Let P = original prediscounted Price

P-.20P = .80P = 15.20

P = 15.20/.8 = 1520/8 = $19.00

20% of 19 = 3.80

19-3.8 = 15.20

(or, as often happens, the store's original price was $15.20

and they just pretend the original price was $19, so they

can advertise a "big discount" of 20%)