Q. Mr. R.K. Nair gets ₹ 6455 at the end of one year at the rate of 14% per annum recurring deposit account. Find the monthly instalment.
Identify Given Values: Step 1: Identify the given values and the formula to use.Mr. R.K. Nair receives ₹ 6455 after one year with an interest rate of 14% per annum on a recurring deposit. We need to find the monthly installment.Using the formula for the future value of a recurring deposit: A=P×r(1+r)n−1Where:- A is the future value (₹ 6455)- P is the monthly installment (unknown)- r is the monthly interest rate (14% per annum, so 1214% per month)- n is the total number of deposits (12 deposits in one year)
Convert Annual Interest Rate: Step 2: Convert the annual interest rate to a monthly interest rate and substitute the values into the formula.The monthly interest rate r is 100×1214=0.01167Substitute into the formula:6455=P×0.01167(1+0.01167)12−1
Calculate Denominator: Step 3: Calculate the denominator (1+0.01167)12−1Using a calculator,(1+0.01167)12≈1.1508So, 1.1508−1=0.1508Now, substitute back:6455=P×0.011670.1508
Solve for P: Step 4: Solve for P (monthly installment).6455=P×1292.5P=1292.56455≈4.995