Exercise $9-21($Algorithmic$)($LO$.5)$

In $2023,$ the CEO of Crimson, Inc., entertains $9$ clients at a skybox in Memorial Stadium for a single athletic event during the year. Substantive business discussions occurred at various times during the event. The box cost $$10,650$ per event and seats $11$ people. $($The cost of a regular, nonluxury box seat at Memorial ranges from $$90$ to $$180.)$ Refreshments served during the event cost $$770.$

How much of these costs may Crimson deduct?