A merchant lent out Rs. 6440 in two parts, one at 8℅ and the other at 12℅ interest. If the average interest comes out to be 9℅.Find the amount lent at 12℅ interest?
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Answer:
Ist Part=x
2nd part6440-x
Xx8/100+ (6440-x) 12/l00=
6440x9/100
multiply by 100
8x+(6440-x) 12=6440x9
8x +77280-12x=57960
- 4x=-19320
x = 4830
1st part x = Rs4830
2nd part 6440-4830 = Rs 1610
Amount lent at 12% interest.
= Rs 1610
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