Bartolo Delivery has two divisions, air express and ground service, that share the common costs of the company's communications network, which are $8,000,000 a year. You have the following information about the two divisions and the common communications network. Air express Ground service Calls (thousands) 532,000 228,000 Time on Network (hours) 345,000 1,035,000 Required: a. What is the communications network cost that is charged to each division if the number of calls is used as the allocation basis? b. What is the communications network cost to each division using time on network as the allocation basis