Difficulty with Volume Problem

The interior surface of the bowl of a goblet is formed by rotating y=3x2, 0http://webwork.uml.edu/webwork2_file...144/char14.pngxhttp://webwork.uml.edu/webwork2_file...144/char14.png2 around the y-axis. Wine is poured into the goblet so that it fills 45% of its capacity. Measured from the bottom of the bowl, what is the depth of the wine?

I know the a,b values are 0,2. This is how I set the integral up.

2pi x Integral((x)(3x^2))

2pi x integral 3x^4

Can someone help me solve this problem please?