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Answer 1 · 2015-11-29T01:14:49

The shape of the pile is called a prismatoid .

Volume of a prismatoid:
#V=1/6[B + (4M) + b]*h#

#B=# the area of the base #=500 ft^2#
#b=# the area of the top #=200 ft^2#
#M=# the area of the middle section #=400ft^2#
#h=# the height #=15 ft#

Now, plug the results into the volume formula:

#V=1/6[500 + (4*400) + 200]*15=5750 ft^3#

Next, calculate the volume of the tower :
#V=3xx4xx9=108 ft^3#

Number of loads #=5750/108~~53# loads

Cost to remove #=$0.60xx53=$31.80#

Hope that helped