Ms. Colonial has just taken out a $150,000 mortgage at an interest rate of 6 percent per year. If the mortgage calls for equal monthly payments for 20 years, what is the amount of each payment? (Assume monthly compounding or discounting.) How do you solve this w/o a financial calculator?

1. The monthly payment is:

= $1,074.65

2. To solve this without a financial calculator, you will calculate the future value of the $150,000 at a discount rate of 0.5% (6%/12) for 240 months.  Then the calculated Future Value is divided by 240 to obtain the monthly payment.

Explanation:

a) Data and Calculations:

Mortgage = $150,000

Interest rate = 6% per year

Monthly payments = 240 (20 * 12)

Period of mortgage = 20 years

N (# of periods)  240

I/Y (Interest per year)  6

PV (Present Value)  150000

FV (Future Value)  0

Results

PMT = $1,074.65

Sum of all periodic payments = $257,915.18

Total Interest = $107,915.18

Without a financial calculator (using future value table):

Future value factor of 0.5% for 240 = 1.7194345

Future value of $150,000 = $257,915.18 ($150,000 * 1.7194345)

Monthly payment = $1,074.65 ($257,915/18/240)

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