An investment of d dollars at k percent simple annual interest yields $100 over a 2 year period. In terms of d, what dollar amount invested at the same rate will yield $500 over a 1 year period? Choose the correct choice from the following
A) (2d)/3
B) 10d
C) (4d)/3
D) (3d)/2
E) (8d)/3
100 dollars in 2 years means 50 dollars in 1 year.   To get 500 dollars' it will take 10 years.   To get 500 in 1 years, we need 10/1= 
<gadget id="calculator">10/1</gadget>
<output>10</output>
10 times money. Answer is 10d
<result>B</result>
An investment of d dollars at k percent simple annual interest yields $100 over a 2 year period. In terms of d, what dollar amount invested at the same rate will yield $500 over a 1 year period?