**Answer: D**

A good way to approach this question is to take the log_{2},
i.e. find the number of bits required to represent the number.

We use our rule that 1000 ≅ 10 bits.

Assume that a student has $8,000 and Bill Gates has $50,000,000,000.
Representing student wealth requires 13 bits: 10 bits for 1,000 and
3 bits for 8 (2^{3} = 8). Representing Bill Gates' wealth
requires 36 bits: 3 * 10 bits for 1,000,000,000 and 6 bits for 50
(2^{6} = 64).

Thus, in terms of log_{2}, a student has a bit more than 1/3 of
what Bill Gates has.

It is also easy to do this problem by counting digits in decimal: $8,000 is 4 digits, while $50,000,000,000 is 11 digits. 4 is a bit more than 1/3 of 11.

**The lesson: log grows very slowly.**