A tall cylindrical concrete pylon is 6.4m high and has a
diameter of 32cm.
If a cubic metre of concrete mix costs $124.50 to lay,
how much will it cost to make twelve such pylons?
Give your answer to the nearest ten dollars
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6
Answer:
vol. of 12pylons = 12xπr 2h
r=0.16m, h=64m
vol=12x3.14x0.16^2 x6.4=6.173m3
cost of concrete @$124.50/m3
6.173x124.5=$768.54
= $770
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