I don't understand. I have already asked for help on this question, and the expert got the same answer, but when I checked my work for 1a, I am told the answer is incorrect. Please, please help.

The McDonald's fast-food restaurant on campus sells an average of 6,400 quarter-pound hamburgers each week. Hamburger patties are resupplied twice a week, and on average the store has 645 pounds of hamburger in stock. Assume that the hamburger patties cost $2 a pound and there are 52 weeks in a year. a. What is the inventory turnover for the hamburger patties? (Do not round intermediate calculations. Round your answer to 1 decimol ploce.) b. On average, how many days of supply are on hand? (Do not round intermediate calculations. Round your answer to 2 decimal ploces.)