APR stands for Annual Percentage Rate, and this is calculated by comparing the total charge for credit which will include all fees etc as well as the interest, with the amount of the loan, and the period of repayment and taking into accolunt as well the regualrity of payments. It is meant to reperesent the real cost of the loan.
I assume you are referring to a loan of �739 at 18.9% APR paid at �20 per month, which will take about 60 months to clear the loan, during which time you will pay �1200 and the total cost will be the differnce between that figure and �739, ie �461. It may be that stoo_pid has fone the calculation more carefully than I have. I have to add that this information must be included on the loan agreement, so far from being confused you just need to read before you sign. Is this a quiz question rather than a genuine inquiry?