Reena took a loan of Rs. 1200 with simple interest for as many years as the rate of interest. If she paid Rs. 972 as interest at the end of the loan period, what was the rate of interest? Choose the correct choice from the following.
A) 3.6 B) 6 C) 9 D) Cannot be determined E) None of these
let rate = R% and time = R years   Then ( 1200 x R x R /100) = 972   =&gt; 12R2= 972   =&gt; R2= 81   =&gt; R= 9   Answer 9
<result>C</result>
Reena took a loan of Rs. 1200 with simple interest for as many years as the rate of interest. If she paid Rs. 972 as interest at the end of the loan period, what was the rate of interest?