Question

A man invests half his capital at the rate of 10% per annum, one third at 9% and the rest at 12% per annum. The average rate of interest per annum which he gets is

Answer 1

average =10%+9%+12%/3
=31/30=1mixed fraction 1/30

Answer 2

Solution :-

Let the capital be 100

Interest on half capital=50×10×1/100=5

Interest on one third =100×9×1/3×100=3

Interest on =(100-50-100/3)×12×1/100

=> 50×12/300=2

Total Interest = 5+3+2 = 10

Hence, 10=100×R×1/100

R=10

Required rate = 10%

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@GauravSaxena01