A cargo container that is 120 feet long, 40 feet wide, and 30 feet tall is to be filled to maximum capacity with identic

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A cargo container that is 120 feet long, 40 feet wide, and 30 feet tall is to be filled to maximum capacity with identical barrels that are right circular cylinders. The barrels have a radius of 2 feet, a height of 6 feet, and can be both stacked and aligned in perfect rows. Which of the following is the closest approximation of the total capacity, in cubic feet, of the barrels that are to be placed in the storage container?

(A) 19,000
(B) 101,000
(C) 115,000
(D) 144,000
(E) 450,000

Answer: C

Source: Princeton Review