1.

A man borrowed some amount, after 3 years he paid Rs.10,400/- with 10% interest, then how much Amount he borrowed?

Answer»

Rs. 8000



principal P = ? 
RATE of interest R = 10
Time T = 3 years 
Accumulated Amount A = Rs.10400/- 

A = P + I 
A = P + PTR/100 
A = P(1+ TR/100) 

Rs.10400/- = P [1 + 3*10/100] 
Rs.10400/- = P [1/1 + 3/10] 
Rs.10400/- = P [10+3/10] = P[13/10] 
Rs.10400/- = P * 13/10 
==> P = Rs.104000/13 
==> P = Rs. 8000



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