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How to calculate interest at an annual interest rate of 9%
Calculate interest according to formula I = p× r.

Taking 10000 as an example, according to the annual interest rate of 9%, the interest can be calculated by formula I = p× r. P stands for principal, that is, 10000 yuan, and r stands for annual interest rate, that is, 9% or 0.09. Substituting the numerical value into the formula gives I= 10000×0.09=900.