First, we have to divide the finance charge by the $350.00 bill. The finance charge is (25$ + $10 = $35). Then, we have to multiplicate this result by 365 (number of days in the year) and finally, divide the result by the number of days 14. I will do the calculations below:
[tex]\text{APR = }\frac{\frac{35}{350}\times365}{14}=2.6071[/tex]Now we multiplicate the result by 100 to get the percentage. This will be 260.71%