Answer :
discount = 15 %
Price paid = $7.65
Original price (x) minus the discount amount (0.15x) must be equal to the price paid. ($7.65)
x-(0.15x ) = 7.65
x-0.15x =7.65
Solve for x
0.85x = 7.65
x = 7.65/ 0.85
x = 9
Original price $9
check:
Replace 9 in the equation:
9- (9 x 0.15 ) = 7.65
9- 1.35 =7.65
7.65 = 7.65