Simple interest on a certain sum is 16.2 over 20 of the sum. Find the rate per cent and time, if both are equal. Choose the correct choice from the following:
A) 8% and 8 years
B) 6% and 6 years
C) 9% and 9 years
D) 12 % and 12 years
E) None of these
16.2â„20 P = PÃ—RÃ—R/100   â‡’ R2 = 1620â„20 â‡’81=&gt; R = 9%   Also, time = 9 years   Answer 9% and 9 years
<result>C</result>
Simple interest on a certain sum is 16.2 over 20 of the sum. Find the rate per cent and time, if both are equal.