A sum of money triples itself in 8years.then the rate of interest is
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Let the rate of interest be a
Principal = a
Amount = 3a
Time = 8 year
SI = Amount - Principal
=> SI = 3a - a
=> SI = 2a
=> PRT / 100 = a
=> a × R × 8 / 100 = a
=> 8 × a × R = 100a
=> R = 100a / 8a
=> R = 25 / 2
=> R = 12.5 p.c.p.a
Principal = a
Amount = 3a
Time = 8 year
SI = Amount - Principal
=> SI = 3a - a
=> SI = 2a
=> PRT / 100 = a
=> a × R × 8 / 100 = a
=> 8 × a × R = 100a
=> R = 100a / 8a
=> R = 25 / 2
=> R = 12.5 p.c.p.a
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