Using the data from Exhibit 12.3, determine the average monthly cost of servicing the typical student’s demand deposit account, which generates 27 home debits, four transit checks, and two deposits per month. Assume that the bank can invest 85 percent of the deposit balance at 7 percent and charges the student $4.50 in fees monthly. What is the break-even deposit balance the bank must hold for its revenues to cover its costs? Compare your average balance with the break-even balance you calculate and deter- mine whether your account would be profitable to the bank. What is your bank’s insufficient funds charge (NSF) and how will these fees influence ac- count profitability?