how to solve this problem
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here is your answer.
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Amount = Rs 15500
Principal = Rs 12500
Time = 4 years
SI = Amount - Principal
=> SI = 15500 - 12500 = Rs 3000
=> ( P× R× T) /100 = 3000
=> ( 12500 × R × 4) / 100 = 3000
=> 125 × 4 × R = 3000
=> 500 × R = 3000
=> R = 3000 /500
=> R = 6
Rate of interest = 6 p.c.p.a
Principal = Rs 12500
Time = 4 years
SI = Amount - Principal
=> SI = 15500 - 12500 = Rs 3000
=> ( P× R× T) /100 = 3000
=> ( 12500 × R × 4) / 100 = 3000
=> 125 × 4 × R = 3000
=> 500 × R = 3000
=> R = 3000 /500
=> R = 6
Rate of interest = 6 p.c.p.a
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