A sum of ₹18000 is lent partly at 7% and the remaining at 9% per annum. If the average annual interest is 8.5%, then the amount lent at 9% is (in ₹):
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Correct answer: C
Explanation
The correct answer is option 3 i.e. ₹13500.
Using alligation method,
7% 9%
8.5%
0.5% 1.5%
The ratio of amounts lent on 7% and 9% = 1 : 3
Now, required answer = [18000/(1 + 3)] × 3
⇒ 3 × 18000/4 = 13500