The sale price is equivalent to 90% = 90/100 of the original price (P).
P x 90/100 = 75.60
Then P = 75.60 x 100/90 = 84
The original price was $84.00
P x 90/100 = 75.60
Then P = 75.60 x 100/90 = 84
The original price was $84.00