If Rs.420 amount to Rs.540 in 4 years, what will it amount to in 6 years at the same rate % per annum?	Select the correct option
A) s.575	B) s.595	C) s.590	D) s.600	E) s.585
80 = (420*4*R)/100   R = 7.14%   I = (420*6*7.14)/100 = 180   420 + 180= 
<gadget id="calculator">420 + 180</gadget>
<output>600</output>
600   ANSWER:s.600
<result>D</result>
If Rs.420 amount to Rs.540 in 4 years, what will it amount to in 6 years at the same rate % per annum?