I need help figuring out what the formula is to calculate APR. Thank you!

Calculate (a) the amount financed, (b) the total finance charge, and (c) APR by formula. (Do not round intermediate calculations. Round the "Finance charge to the nearest cent and "APR" to the nearest tenth percent.) Purchase price of a used car 5,833 APR Down payment $ 1,303 Answer is complete but not entirely correct. Amount Total of monthly Total finance financed payments charge s 4,530$ 5,889.76 1,359.76 Number of monthly payments 48 $ 1.3 %