Please help answer this question

Question

Answer 1

d=12 h=60

r=d/2 = 6, only half the silo is filled, that makes h/2 = 30

V=(h/2)pir^2 = 30pi(6^2) = 1080pi =3392.9 ft^3

Must be a typo or misprint, but the 3rd answer is most certainly what they want: 3,391.2