Question

a borrowed amount of 4000 amounts 5400 in 5 years . how much will 5600 amount to in 3 years at the same rate?

Answer 1

let rate be x
4000+4000x% (5) =5600
4000x%(5)= 1600
x = 1600×100÷4000÷5 = 8
when amount 5600
then after 3year amount will be
5600 + 5600×8%×3 = 6944

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Answer 2

principal = 4000
amount = 5400
time = 5 years
si = amount - principal
si = 5400 - 4000
si = 1400
rate = 100×si ÷p×t
rate = 100 × 1400 ÷ 4000×5
rate = 4.5% p.a
New principal = 5600
time = 3 years
rate = 4.5% p.a
si = p×r×t ÷100
si = 5600×3×4.5÷100
si = 756
amount =p + si
amount = 6356