Bottles of Perfume Sometimes Have Thick Glass (N = 1

Multiple Choice

Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it really is. Assume a cylindrical bottle with an inner radius of 1.0 cm and an outer radius of 2.0 cm. What percentage of the apparent volume is the real volume?

A) 95%
B) 60%
C) 80%
D) 64%
E) 75%