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A person lends 40% of his sum of money ...

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 interset. What would be the annual rate of interset. If the interset is calculated on the whole sum?

A

13.4 % per annum

B

14.33 % per annum

C

14.4 % per annum

D

13.33 % per annum

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The correct Answer is:
C
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