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?	Choices
A) 3.5 years B) 4 years C) 4.5 years D) 5 years E) 6 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?