An investment of d dollars at k percent simple annual interest yields $900 over a 2 year period. In terms of d, what dollar amount invested at the same rate will yield $1,800 over a 3 year period? Choose the correct choice from the following choices.
A) (2d)/3	B) (3d)/4	C) (4d)/3	D) (3d)/2	E) (8d)/3
900 dollars in 2 years means 450 dollars in 1 year.   To get 1800 dollars' it will take 4 years.   To get 1800 in 3 years, we need 4/3 times money. Answer is (4d)/3.
<result>C</result>
An investment of d dollars at k percent simple annual interest yields $900 over a 2 year period. In terms of d, what dollar amount invested at the same rate will yield $1,800 over a 3 year period?