You then subtract that answer by 1 to get your interest rate in decimal form. Given formula where P is initial amount inveted r is rate of interest in decimal and A is the compound amount at the end of t years. Calculate rate of interest in decimal solve for r r AP 1t - 1.
You then subtract that answer by 1 to get your interest rate in decimal form.
Note that rate R r and time t should be in the same time units such as months quarters or years. Tap for more steps. Use the compound interest formula AP 1rnnt to answer the following questions. Sometimes interest is compounded more often than annually For example if 6 interest is compounded four time per year quarterly then one receives 15 interest every three months.