How much time will take for an amount of Rs. 300 to yield Rs. 81 as interest at 4.5% per annum of simple interest?
Pick one.
A) 7
B) 4
C) 6
D) 3
E) 2
Time = (100 * 81) / (300 * 4.5)= 
<gadget id="calculator">(100 * 81) / (300 * 4.5)</gadget>
<output>6</output>
6 years'   Answer:6
<result>C</result>
How much time will take for an amount of Rs. 300 to yield Rs. 81 as interest at 4.5% per annum of simple interest?