Rock Solid Bank and Trust (RSB&T) offers only checking accounts. Customers can write checks and use a network of automated teller machines. RSB&T earns revenue by investing the money deposited; currently, it averages 6.90 percent annually on its investments of those deposits. To compete with larger banks, RSB&T pays depositors 0.50 percent on all deposits. A recent study classified the bank's annual operating costs into four activities. Activity Cost Driver Cost Driver Volume Using ATM Number of uses $ 4, 050, 000 5,400, 000 uses Visiting branch Number of visits 2, 430, 000 405, 000 visits Processing transaction Number of transactions 17, 820, 060 216,000, 000 transactions Managing functions Total deposits 16, 200, 000 $1, 012, 500,000 in deposits Total overhead $40, 500, 000 Data on two representative customers follow. Customer A Customer B ATM uses 100 200 Branch visits 5 20 Number of transactions 40 1, 500 Average deposit $6, 000 $6, 000 Required: a. Compute RSB&T's operating profits. b. Compute the profit from Customer A and Customer B, assuming that customer costs are based only on deposits. Interest costs = 0.50 percent of deposits; operating costs are 4 percent (= $40,500,000/$1,012,500,000) of deposits. c. Compute the profit from Customer A and Customer B, assuming that customer costs are computed using the information in the activity-based costing analysis