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प्रश्न
At what rate, percent per year will a sum double itself in `6 1/4` years?
उत्तर
Let P = Rs. 100
∴ Amount = 2 × Rs. 100 = Rs. 200
Interest = A − P
= Rs. 200 − Rs. 100
= Rs. 100
T `=6 1/4` years =`25/4` years
`"R" =(100xx"I")/("P"xx"T")=(100xx100)/(100xx25/4)%=(100xx100)/100xx4/25`
= 16%
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