# At the same rate

Case 1:

Amount = Principal + Interest

P = p, r = ?, t = 7 yrs and I = I

As we know,   Rs. 7100  Case 2:

P = p, r = ?, t = 4 yrs and I = I

As we know,   Amount = Principal + Interest

Rs. 6200 = p +  Dividing the above equations we get,  7100 + 284r = 6200 + 434r

900 = 150r To find the value of principal putting the value of r in any equation

7100 = p = = Rs. 5000

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