A sum ofmoney lent at compound interest for 2 years at 20% per annum would fetch Rs482 more, if the interest was payable half-yearly than if it was payableannually. The sum is:(a) Rs10,000 (b) Rs 20,000 (c) Rs 40,000 (d) Rs 50,000

A sum ofmoney lent at compound interest for 2 years at 20% per annum w

1.	A sum ofmoney lent at compound interest for 2 years at 20% per annum would fetch Rs482 more, if the interest was payable half-yearly than if it was payableannually. The sum is:(a) Rs10,000 (b) Rs 20,000 (c) Rs 40,000 (d) Rs 50,000
Answer» 0.07 0.13 0.15 0.22 Solution :Number of students in the college =7200 Number of boys `=(7)/(12)xx7200=4200` Number of girls `=(5)/(12)xx7200=3000` Number of student in B.Tech. (nano techonology) =22% or 7200=1584 Number of girlsin B. Tech. (COMPUTER science) =16% of 3000=480 Number of boys in B.Tech.(mechanical)= =18% of 4200 =630 Number of girls in B.Tech.(civil) =30% of 480 =144 Number of boys in B.Tech. (electronics)=15% of 4200 =630 Number of boys in B.Tech. (computer science) =50% or 180=240 Number of giflsin B.Tech.aerospace) 15% of 3000 = 45000 Number of boys in B.Tech (civil) `=(3)/(1)xx144=432` Number of students in B.Tech (electronics) 24% of 72000 =1728 `:.` Number of girls in B.Tech. (electronics)= 1728-630 =1098 Numberof boys in B.Tech (aerospace) =`(12)/(5)xx450=1080` Number of boys in B.Tech(nano technoloy) = Remaining Number of boys =4200-(750+630+240+432+1080) =4200-3138=1062 `:.` Number of girls in B.Tech (mechanical) = Remaining Number of girls =3000-(480+144+450+1098+522) = 3000-2694=306 Tablular form of above information is whon below. Number of girls enroled in B.Tech (electronics) =1098 `:.` Required PERCENTAGE `=(1098)/(7200)xx100%` `=15.25~~15%`