Reena took a loan of $. 1200 with simple interest for as many years as the rate of interest. If she paid $ 972 as interest at the end of the loan period, what was the rate of interest?	Choose the correct choice from the following answers
A) 3.6	B) 6	C) 18	D) Cannot be determined	E) None of these
Let rate = R% and time = R years.   Then,1200 x R x R/100= 972   12R2 = 972   R2 = 81   R = 9.   Answer:None of these
<result>E</result>
Reena took a loan of $. 1200 with simple interest for as many years as the rate of interest. If she paid $ 972 as interest at the end of the loan period, what was the rate of interest?