Where the amount is given by. A P 1 rt Calculate Principal Amount solve for P. T number of years.
To calculate compound interest we need to know the amount and principal.
In the unit compound interest we study the calculation of compound interest and derive the formula to find the compound interest. After one year you will have 100 10 110 and after two years you will have 110 10 121. Simple interest math formula and problems for 7th-grade math students. Simple interest i 5 100 prn compound interest a 5 1 100 p r n 1 final amount i 5 a 2 p interest where p is the principal r is the interest rate per period expressed as a percentage n is the number of periods use 1 year 5 52 weeks 5 365 days.