Question:
Parameshwaran 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.
(a)
Rs. 20000 (b) Rs. 22000 (c) Rs. 25000 (d) Rs. 24000 (e) none of these
Detailed Explanation: Parameshwaran invested Rs
12000 at the simple interest rate of 10% pa another amount at the simple interest
rate of 20% pa. The mean rate is given as 14% pa.
The ratio of their investment, by the method of
Alligation is, (20 – 14) : (14 - 10)
That is, 6 : 4 means, 3 : 2
Investment at the rate of 10% is 3 ≡ Rs 12000
Investment at the rate of 20% is 5 ≡ ? that is, Rs
20000 Ans.
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