Question
Mr. Satish invested an amount of Rs. 12000 at the simple interest rate of 10% per annum and another amount at the simple interest rate of 20% per annum. The total interest earned at the end of one year on the total amount invested became 14% per annum. Find the total amount invested?
Answer: Option A
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Here, P1 = Rs. 12000, R1 = 10%, P2 = ?, R2 = 20%, R = 14%
Therefore, using the formula
R =
P1R1 + P2R2
P1 + P2
We get, 14 =
12000 x 10 + P2 x 20
12000 + p2
or, P2 = Rs. 8000
Total amount invested = Rs.(12000 + 8000) = Rs. 20000
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