A = P(1 + rt)
A = Total Accrued Amount (principal + interest)P = Principal AmountI = Interest Amountr = Rate of Interest per year in decimal; r = R/100R = Rate of Interest per year as a percent; R = r * 100t = Time Period involved in months or yearsFrom the base formula, A = P(1 + rt) derived from A = P + I and I = Prt so A = P + I = P + Prt = P(1 + rt)
Note that rate r and time t should be in the same time units such as months or years. An example would be...