Question

A jar of mayonnaise is shaped like a cylinder. The radius of the jar is 1.5 in. and its height is 7 in. The mayonnaise sells for $0.08 per in³. What is the cost of the jar of mayonnaise? Use 3.14 to approximate pi. Round your answer to the nearest penny.

Answer 1

Determine the volume
The mayonnaise is sold per unit of volume (in³). Therefore we need to find the volume of the jar to determine the cost. The volume of the jar is equal to the volume of a cylinder.
v = π × r² × h

Input the numbers
v = 3.14 × (1.5)² × 7
v = 3.14 × 2.25 × 7
v = 49.445
The volume of the jar is 49.445 in³

Determine the cost
cost = volume in in³ × the cost per in³
cost = 49.445 × 0.08
cost = 3.9564
to the nearest hundredth
cost = 3.96

The cost of the jar of mayonnaise is $3.96

Answer 2

The answer is $3.96 because 3.15x1.5=4.71x7.065x7=49.455x0.08=3.9564 rounded up equals $3.96