An investment of d dollars at k percent simple annual interest yields $200 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
200 dollars in 2 years means 100 dollars in 1 year.   To get 2400 dollars' it will take 24 years.   To get 2400 in 3 years, we need 24/3= 
<gadget id="calculator">24/3</gadget>
<output>8</output>
8 times money. Answer is 8d.
<result>E</result>
An investment of d dollars at k percent simple annual interest yields $200 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?