Two oil cans, X and Y, are right circular cylinders, and the height and the radius of Y are each twice those of X. If the oil in can X, which is filled to capacity, sells for $2, then at the same rate, how much does the oil in can Y sell for if Y is filled to only half its capacity?
(A) $1
(B) $2
(C) $3
(D) $4
(E) $8
Ans: E.
Mine is D.
assume Y's radiu is R, height is H
X's radiu is r, height is h
Y's capacity is 4 times as X's
s Y's oil worth $2*4=8, then half capacity gives $4, which is answer D.
how comes to E??
NN, pls take a look and help, thanks a lot | 
