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2016-04-12T22:38:44+05:30

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Given:
75,000

75,000 * 6% * 1 yr = 4,500

30,000 * 5% * 1 yr = 1,500
24,000 * 4% * 1 yr =    960

4,500 - 1,500 - 960 = 2,040

75,000 - 30,000 - 24,000 = 21,000

21,000 * r * 1yr = 2,040
r = 2,040 / 21,000
r = 0.097 or 9.7%

The remaining money should be invested at 9.7% per annum.
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