The material used to make a storage box costs $1.25 per square foot. The boxes have the same volume. How much does a company save by choosing to make 50 of Box 2 instead of 50 of Box 1?

Question

The material used to make a storage box costs $1.25 per square foot. The boxes have the same volume. How much does a company save by choosing to make 50 of Box 2 instead of 50 of Box 1?
Box 1: 20x6x4 in
Box 2: 15x4x8 in

oobleck · Accepted Answer

[2(20*6 + 20*4 + 6*4) - 2(15*4 + 15*8 + 4*8) ] * 1.25/144 = 0.2083 = 20.83¢