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If the rate of simple interest per annum...

If the rate of simple interest per annum decreases from `4%` to `3(3)/(4)%`, then the yearly income of a person decreases by `60Rs`. Find the principal of that person.

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`(4-3(3)/(4))%=(1)/(4)%`
As per question, `Rs(1)/(4)` interest decreases when principal `=Rs100`
`1Rs`,, ,, ,, ,, `=Rs100xx4`
`Rs60` ,, ,, ,, ,, `=Rs100xx4xx60`
`=Rs24000`
Hence the required principal `=Rs 24000`.
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CALCUTTA BOOK HOUSE-SIMPLE INTEREST-Very-short answer type questions
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