Please help me with this problem.

Under the proposed new system (two drive-up windows and two waiting lanes), the average time (in minutes) a customer waits in line is .76 2.67 4.76 6.67 If the second drive-up window is added, the bank's revenue would increase by $18,660 $22,480 $26,660 $30,480 Based on the previous result and the annual cost of the second drive-up window ($20,000), the First American Bank should NOT install the second drive-up window. True False The First American Bank of Rapid City has one outside drive-up teller. It takes the teller an average of 4 minutes to serve a bank customer. Customers arrive at the drive-up window at a rate of 12 per hour. The bank operation officer is currently analyzing the possibility of adding a second drive-up window, at an annual cost of $20,000. It is assumed that arriving cars would be equally divided between both windows. The operation officer estimate that each minute's reduction in customer waiting time would increase the bank's revenue by $2,000. The service rate (\# of customers per hour) of the drive-up teller is (type number only, no text) Under the current system of the First American Bank (one drive-up window and one waiting lane), the average time (in minutes) a customer waits in line is .33 16 18 20