How much time will take for an amount of Rs. 150 to yield Rs. 81 as interest at 4.5% per annum of simple interest?
Select the correct option:
A) 7
B) 4
C) 5
D) 12
E) 2
Time = (100 * 81) / (150 * 4.5)= 
<gadget id="calculator">(100 * 81) / (150 * 4.5)</gadget>
<output>12</output>
12 years'   Answer:12
<result>D</result>
How much time will take for an amount of Rs. 150 to yield Rs. 81 as interest at 4.5% per annum of simple interest?