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The compound interest on a certain sum for 2 years at 10% per annum is Rs. 1155. The simple interest on the same sum for double the time at half the rate percent per annum is ? |
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Answer» A. 2400 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. The number of boys enrolledin B.Tech (civi'l) =432 |
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