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What is the formula for calculating simple interest?
I = P r t
I = Interest earned/paid
P = Principal (initial amount)
r = Annual interest rate (as a decimal)
t = Time in years
What are the two formulas for finding the Future Value (A) with simple interest?
A = P + I (Principal + Interest)
A = P(1 + rt) (Principal times the growth factor)
What is the formula for Compound Interest?
A = P(1 + r/n)^(nt)
A = Future value of the account
P = Principal
r = Interest rate per year (as a decimal)
t = Time/Term in years
n = Number of times interest is compounded per year (e.g., 12 for monthly, 4 for quarterly, 365 for daily).
How do you calculate just the interest earned (not the total future value) using compound interest?
Compound Interest = A - P (Future Value minus the original Principal).