Question

If rs. 3700 amount to rs. 5365 in 5 years what will be rs. 8400 amount to in 4 years at the same rate percent per annum?

Answer 1

1st Case:

Principal = ₹3700
Amount = ₹5365
Time = 5 years
S. I. = (Amount - Principal) = (₹5365 - ₹3700) = ₹1665
Rate percent per annum = 100 × S. I./P × T = 100 × 1665/3700 × 5 = 9% per annum

2nd Case:

Principal = ₹8400
Time = 4 years
Rate percent per annum = 9% per annum
S. I. = P × R × T/100 = 8400 × 9 × 4/100 = ₹3024
Amount = (Principal + S.I.) = (₹8400 + ₹3024) = ₹11424