An investment of d dollars at k percent simple annual interest yields $600 over a 2 year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 over a 3 year period?  Choose the correct option:	A) (2d)/3	B) (3d)/4	C) (4d)/3	D) (3d)/2	E) (8d)/3
600 dollars in 2 years means 300 dollars in 1 year.   To get 2400 dollars' it will take 8 years.   To get 2400 in 3 years, we need 8/3 times money.   Answer is (8d)/3.
<result>E</result>
An investment of d dollars at k percent simple annual interest yields $600 over a 2 year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 over a 3 year period?