Question
If the annual rate of simple interest increases from 10% to `12 1/2`% , a man's yearly income increases by Rs. 1250. His principal (in Rs.) is :
Answer: Option B
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Let the sum be Rs. `x` , Then ,
`(x xx 25/2 xx 1/100) - ((x xx 10 xx 1)/(100))` = 1250
`hArr 25x - 20x = 250000`
`hArr 5x = 250000`
`hArr x = 50000`
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