I can not figure this problem out.

Problem 13.48 The concession stand at the Shelby High School stadium sells slices of pizza during boys' and girls' soccer games. Concession stand sales are a primary source of revenue for the high school athletic programs, so the athletic director wants to sell as much food as possible; however, any pizza not sold is given away free to the players, coaches, and referees or it is thrown away. Thus, the athletic director wants to determine a reorder point that will meet the demand for pizza. Pizza sales are normally distributed with a mean of 10 pizzas per hour and a standard deviation of 3.50 pizzas. The pizzas are ordered from Pizza Beth's restaurant, and the mean delivery time is 20 minutes, with a standard deviation of 10 minutes. Currently the concession stand places an order when there is 1 pizza left. What level of service does this result in? (Round answer to 2 decimal places, e.g. 52.75%.) Level of service % LINK TO TEXT What should the reorder point be to have a 98% service level? (Round answer to 3 decimal places, e.g. 5.275.) Reorder point pizzas