E$4-19.$ Special Order Nature's Garden, a new restaurant situated on a busy highway in Pomona, California, specializes in a chef's salad selling for $$7.$ Daily fixed costs are $$1\mathrm{.}200,$ and variable costs are S$4$ per meal. With capacity of $800$ meals per day, the restaurant serves an average of $750$ meals each day. Required a$.$ Determine the current average cost per meal. b$.$ A busload of $30$ Girl Scouts stops on its way home from the San Bernardino National Forest. The leader offers to bring them in if the scouts can all be served a meal for a total of S$150.$ The owner refuses, saying he would lose $$0\mathrm{.}60$ per meal if he accepted this offer. How do you think the owner arrived at the S$0\mathrm{.}60$ figure? Comment on the owner's reasoning. A local businessman on a break overhears the conversation with the leader and offers the owner a one$-$year contract to feed $300$ of the businessman's employees one meal each day at a special price of $54\mathrm{.}50$ per meal. Should the restaurant owner accept this offer? Why or why not?