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Q: A person lends 40 % of his sum of money at 15 % per annum, 50 % of rest at 10 % per annum and the rest at 18 % per annum rate of interest. What would be the annual rate of interest, if the interest is calculated on the whole sum?

A. 0.144
B. 0.1333
C. 0.134
D. 0.1433
Answer» B. 0.1333


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