A hospital pharmacy charges $ 0.40 per fluidram of a certain medicine but allows a discount of 15 percent to Medicare patients. How much should the pharmacy charge a Medicare patient for 3 fluidounces of the medicine? (128 fluidrams = 16 fluidounces)

Question: A hospital pharmacy charges $ 0.40 per fluidram of a certain medicine but allows a discount of 15 percent to Medicare patients. How much should the pharmacy charge a Medicare patient for 3 fluidounces of the medicine? (128 fluidrams = 16 fluidounces)

Solution:
16 fluidounces = 128 fluidrams
∴ 1 fluidounces = 128/16 fluidrams = 8 fluidrams
∴ 3 fluidounces = 3 × 8 = 24 fluidrams

Cost of 24 fluidrams = 24 × 0.40 = 9.6
Cost after 15% discount = 0.85 × 9.6 = 8.16