In: Math
A sum of Rs.6000 is borrowed at 10% pa compounded interest and paid back in three equal annual instalments.
What is the approximate amount of each instalment?
Suppose the value of every instalment is Rs.P
If an amount P is compounded at interest rate of R for T years then the total amount = P(1 + R/100)T
Total amount to be paid = 6000 (1 + 10/100)3
Now when a person is giving first instalment of Rs.P at the end of 1st year it means on that amount compounded
interest will be applicable for 2 years. Similarly for 2nd instalment compounded will be applicable for 1 year.
So, P(1 + 10/100)2 + P(1 + 10/100) + P = 6000(1 + 10/100)3
=> 3.31P = 7986 => P = 2412 = Rs.2400 (approx.)
Amount for each installment = Rs.2400