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 answer:
A) 8 years	B) 4 years	C) 3 years	D) 9 years	E) 5 years
Time = (100 * 81) / (450 * 4.5)= 
<gadget id="calculator">(100 * 81) / (450 * 4.5)</gadget>
<output>4</output>
4 years   Answer: 4 years
<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?