A person borrowed Rs.600 @ 3% per annum S.I and Rs.800 @ 4½ % per annum on the agreement that the whole sum will be returned only when the total interest becomes Rs.246. The number of years, after which the borrowed sum is to be returned, is	Choose one:
A) 2 years
B) 3years
C) 4 years
D) 5 years
E) 6 years
Let the time be x years. Then (600 *3* x)/100 + (800*9*x)/(2*100) = 24   18x+ 36x = 246 ; x = 246/54 = 4 years   Required time = 4 years   ANSWER:4 years
<result>C</result>
A person borrowed Rs.600 @ 3% per annum S.I and Rs.800 @ 4½ % per annum on the agreement that the whole sum will be returned only when the total interest becomes Rs.246. The number of years, after which the borrowed sum is to be returned, is