If $120 invested at a certain rate of simple interest amounts to $180 at the end of 3 years,How much will $150 amount to at the same rate of interest in 6 years? Choose one:
A) $190
B) $180
C) $200
D) $240
E) $300
120 amounts to 180 in 3 years.   i.e (principal + interest ) on 120 in 3 years = 180   120 + 120*(r/100)*(3) = 140 =&gt; r = 50/3   150 in 6 years = principal + interest   =300   Answer is $300.
<result>E</result>
If $120 invested at a certain rate of simple interest amounts to $180 at the end of 3 years,How much will $150 amount to at the same rate of interest in 6 years?