1993 AHSME Problem 9

Country A has c\% of the world's population and d\% of the worlds wealth. Country B has e\% of the world's population and f\% of its wealth. Assume that the citizens of A share the wealth of A equally,and assume that those of B share the wealth of B equally. Find the ratio of the wealth of a citizen of A to the wealth of a citizen of B.

\text{(A) } \frac{cd}{ef}\quad \text{(B) } \frac{ce}{ef}\quad \text{(C) } \frac{cf}{de}\quad \text{(D) } \frac{de}{cf}\quad \text{(E) } \frac{df}{ce}

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.