Reena took a loan of Rs. 2000 with simple interest for as many years as the rate of interest. If she paid Rs. 720 as interest at the end of the loan period, what was the rate of interest? Choose the correct answer:
A) 6  B) 7  C) 8  D) 9  E) 10
Let rate = R% and time = R years.   =(2000xRxR)/100 =720   =20Rsquare =720   R Square = 720/20= 
<gadget id="calculator">720/20</gadget>
<output>36</output>
36   R= 6   6NSWER :6
<result>A</result>
Reena took a loan of Rs. 2000 with simple interest for as many years as the rate of interest. If she paid Rs. 720 as interest at the end of the loan period, what was the rate of interest?