AMC 8 1988 Problem 12

Suppose the estimated $20$ billion dollar cost to send a person to the planet Mars is shared equally by the $250$ million people in the U.S. Then each person's share is $\text{(A)}\ 40\text{ dollars} \text{(B)}\ 50\text{ dollars} \text{(C)}\ 80\text{ dollars} \text{(D)}\ 100\text{ dollars} \text{(E)}\ 125\text{ dollars}$