How to find the annual compound interest rate
18 Sep 2019 The compound interest formula is ((P*(1+i)^n) - P), where P is the principal, i is the annual interest rate, and n is the number of periods. Using the Compound interest formulas to find principal, interest rates or final investment Where: A = P(1 + r/n)nt. Principal (P): $. Rate (R): % annual. Compound (n):. Regular Compound Interest Formula. P = principal amount (the initial amount you borrow or deposit). r = annual rate of interest (as a decimal). t = number of