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compound interest formula how to find rate. For the above calculation you have 450000 to invest or borrow with a rate of 95 percent for a six-year period of time. The trick to using a spreadsheet for compound interest is using compounding periods instead of simply thinking in years.
BeginalignedtextBeginning Valuetimesleft1leftfractextinterest ratetextNCPPY. R is the annual interest rate. R annual interest rate.
A the future value of the investmentloan including interest P the principal investment amount the initial deposit or loan amount r the annual interest rate decimal n the number of times that interest is compounded per unit t t the time the money is invested or borrowed for.
P number of payment periods per year. Compound interest is when a bank pays interest on both the principal the original amount of moneyand the interest an account has already earned. N is the number of times that interest is compounded per unit t for example if interest is compounded monthly and t is in years then the value of n would be 12. P is the principal amount.