Simple interest on a certain sum is 22.5 over 10 of the sum. Find the rate per cent and time, if both are equal.	Choose the correct answer
A) 8% and 8 years	B) 15% and 15 years	C) 10% and 10 years	D) 12 % and 12 years	E) None of these
22.5â„10 P = PÃ—RÃ—R/100   â‡’ R2 = 2250â„10 â‡’ 225 =&gt; R = 15%   Also, time = 15 years   Answer 15% and 15 years
<result>B</result>
Simple interest on a certain sum is 22.5 over 10 of the sum. Find the rate per cent and time, if both are equal.