Solve the problem. Round to the nearest tenth unless indicated otherwise.
-The cost of stainless steel tubing varies jointly as the length and the diameter of the tubing. If a 5 foot length with diameter 2 inches costs $48.00, how much will a 15 foot length with diameter
6 inches cost? Round to the nearest cent.
A) $432.00
B) $437.57
C) $437.30
D) $429.60

Question

Quizplus · Accepted Answer

The cost of the tubing is directly proportional to both the length and the diameter. Therefore, if the length triples from 5 feet to 15 feet and the diameter triples from 2 inches to 6 inches, the cost will increase by a factor of 3 (for length) times 3 (for diameter), which is 9 times. So, $48.00 times 9 equals $432.00.

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