Question

How much will you pay the cashier for a candy bar that originally costs 79 cents and is now marked 15% off? Sales tax is 5.5%

Answer 1

79 cents marked down 15% 
so
79 x (1 - 0.15) 
79 x 0.85 = 67 cents
plus Sales tax is 5.5%

67 x (1.055) = 71 cents

answer
71 cents