How much time will take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?
Choose the correct choice from the following
A) 7
B) 4
C) 5
D) 3
E) 2
Time = (100 * 81) / (450 * 4.5)= 
<gadget id="calculator">(100 * 81) / (450 * 4.5)</gadget>
<output>4</output>
4 years'   Answer:4
<result>B</result>
How much time will take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?