Answer: c
A) you multiply 50 by 0.2 to get the discounted price and you subtract it by the original price. 50(0.2) = 10, 50 - 10 = 40.
B) Multiply 40 by 1.07 to get the amount after tax. 40(1.07) = 42.8
C) Multiply 42.8 by 1.2 to get price after tip. 42.8(1.2) = 51.36