If $120 invested at a certain rate of simple interest amounts to $240 at the end of 3 years,How much will $150 amount to at the same rate of interest in 6 years?
Pick
A) $190  B) $180  C) $200  D) $340  E) $450
120 amounts to 240 in 3 years.   i.e (principal + interest ) on 120 in 3 years = 240   120 + 120*(r/100)*(3) = 240 =&gt; r = 100/3   150 in 6 years = principal + interest   = 150 + 150*(r/100)*(6)   = 450   Answer is $450.
<result>E</result>
If $120 invested at a certain rate of simple interest amounts to $240 at the end of 3 years,How much will $150 amount to at the same rate of interest in 6 years?