Problem Solving

An investment of D dollars at K percent simple interest rate yields $600 over a two year period. In terms of d, what dollar amount invested at the same rate will yield $2400 interest over a 3year period?

A.) 2/d3

B.) 3d/4

C.) 4d/3

D.) 3d/2

E.) 8d/3

Any help on this would be great!