A Conical Tank with Vertex at the Bottom and Top $\pi$

Multiple Choice

A conical tank with vertex at the bottom and top radius 10 cm is 40 cm tall. It is filled with a substance whose density at depth y cm is (2 + y) g/ . Find the total mass of the substance filling the tank.

A) 15 $\pi$ kg
B) 16 $\pi$ kg
C) 17 $\pi$ kg
D) 18 $\pi$ kg
E) none of the above