Bob wishes to put the mulch in a pit in the shape of a rectangular solid 20 ft long, 15 ft wide, and 9 in deep.

a) the volume, in cubic feet, of mulch Bob will need?

b) If mulch costs $11 per cubic foot, what will the cost of the mulch be?

a) 20 x 15 x .75 = 225 cu.ft. [note that we replace 9 in with .75 ft to ensure unit consistency]

b) 225 x 11 = $2,475

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