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The Compound Interest program is built on the principle of the following formulas, where P is the principal, A is the balance, r is the rate in percentage (ex. .07) , n is the number of times compounded, and t is the time:

• Compound interest formula: A = P (1 + r/n)^nt

• Continuous compound interest formula: A = Pe^rt

• Principal doubled formula (derived from Compound interest formula): t = (log 2)/ (n * log ( 1 + (r/n)))