If Rs.450 amount to Rs.540 in 4 years, what will it amount to in 6 years at the same rate % per annum?  Choose the correct answer:
A) 338 B) 277 C) 585 D) 676 E) 181
90 = (450*4*R)/100   R = 5%   I = (450*6*5)/100= 
<gadget id="calculator">(450*6*5)/100</gadget>
<output>135</output>
135   450 + 135= 
<gadget id="calculator">450 + 135</gadget>
<output>585</output>
585   Answer:585
<result>C</result>
If Rs.450 amount to Rs.540 in 4 years, what will it amount to in 6 years at the same rate % per annum?