Fast Food Drive$-$Up: Economic Analysis of Alternative Designs. The following cost information is available for the fast$-$food franchise in Problem $22$:Customer waiting time is valued at $$25$ per hour to reflect the fact that waiting time is costly to the fast$-$food business. The cost of each employee is $$6\mathrm{.}50$ per hour. To account for equipment and space, an additional cost of $$20$ per hour is attributable to each server