what part is missing. since i got 555 wrong im not sure where to start

Points] BRECMBC9 13.11.036. Ealculate the missing information for the installment loan that is being paid off early. 11 Points] BRECMBC9 13.11.050. Tim Houston purchased a wall unit for $2,300. He made a $800 down payment and financed the balance with an instaliment loar month, use the APR formule to calculate what annual percentage rate he is paving on the inan