A) Rs. 10000
B) Rs.18000
C) Rs.15000
D) Rs.12000
E) Rs.16000
Correct Answer: A
Solution :
Logical approach (By alligation method) Total interest = 4050 Average rate of interest \[=\frac{4050}{25000}\times 100=16.2%\] Now, Now, at the rate of 18% amount, \[=\frac{25000}{5}\times 2=Rs.10000\] Another method: Let the amount invested at the rate 15% be Rs. x. Then, at the rate of 18% the amount invested will be Rs. (25000 - x). Now \[=\frac{(25000-x)\times 18\times 1}{100}+\frac{x\times 15\times 1}{100}=4050\] \[\Rightarrow 25000\times 18-18x+15x=4050\times 100\] \[\Rightarrow 3x=25000\times 18-4050\times 100\] \[=450000-405000=45000\] \[\therefore x=15000\] \[\therefore \]Amount invested at the rate of 18% = 25000 - 15000 = Rs. 10000You need to login to perform this action.
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