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英文应用题求助1,you are athe manager for a shopping center.the cent

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英文应用题求助
1,you are athe manager for a shopping center.the center has a circular flower bed whose diameter is 12 meters.you want to lay mulch 15cm deep over how many cubic meters of mulch should you order?
A 16
B 17
C 50
D 283
E 1700
答案是B,16.96立方米.
题目意思是,一个花环,直径12M,要堆覆盖物,覆盖物15CM深,计算总共需要多少立方米的覆盖物,公式:
(12/2)*3.14*0.15=16.96立方米