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

A person lends 40% of his sum of money at 50% 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

`25.4%`

B

`26.5%`

C

`26.6%`

D

`28.4%`

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The correct Answer is:
D
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