In: Computer Science
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?
SOLUTION :
Borrowed amount = Rs.6000
Paid back in 3 equal annual instalments.
Interest rate , r = 10% = 0.10 in decimals (annually compounded)
=> (1 + r) = 1.10
Let the annual instalment be Rs. X .
The PV of the 3 instalments discounted at the indicated rate of interest should be equal to the amount of borrowing.
So, PV of Rs. X paid annually for 3 years and discounted at the rate 0f 10%
= Rs. 6000
=> X/1.1 + X/1.1^2 + X/1.1^3 = 6000
=> X(1/1.1 + 1/1.1^2 + 1/1.1^3) = 6000
=> X * 2.48685 = 6000
=> X = 6000/2.48685 = 2412.69 (Rs)
The approximate amount of each instalment is = Rs 2412.69 (ANSWER)
The approximate amount of each instalment is = Rs 2412.69