Finishing capital = starting capital x (1 plus interest rate) to the power of the term.
EG 1000 units at 5% over 7 years = 1000 x (1.05 to the power 7)
Easiest way to do this is to use logarithms:
1000 x antilog (7 x log 1.05) = 1000 x antilog 0.1483251
= 1000 x 1.4071
= 1407.1 units
This compares with simple interest where finishing capital would be 1350 units.
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Interest payments can calculated annually, quarterly, monthly, daily or even continuously. To enable consumers to compare rates quoted over different periods, many authorities require financial institutions to calculate the total compound interest over a year. That is the AER.
Growth triangle
Interest rates are also known as discount rates because in order to calculate the present value of a future amount, the future amount must be discounted back to the present
The interest rates paid on the deposited money and the number of years you leave the money in the bank.
Or you could just do the same thing in a spreadsheet without having to pay commercial rates for the program to be written for you