You can use the same interest rate calculation concept with other time periods. SI Prt A PSI Where A Final amount SI Simple interest P Principal amount Initial Investment r Annual interest rate in percentage t Time period in years. To calculate interest multiply the principal by the interest rate and the term of the loan.
R r 100.
A Total Accrued Amount principal interest P Principal Amount. Then enter a number of years months or days that the calculation is to run. The simple interest formula. In some cases you may even have to make use of logarithms.