$3\mathrm{.}9.$a$.$ Identify throughput, inventory, and flow time ateach stage.b$.$ What profit does Cheapest earn per week with thecurrent system? Assume that each car loses $$40$ in value per week because of depreciation.c$.$Cheapest is comparing two possible improve$-$ ments:$1.$ Decrease time in repairs from $2$ weeks to $1$ week. $2.$ Decrease cost per repair from $$150$ per car to$$120$ per car while keeping flow time in repairsat $2$ weeks.Assume that the effort that is required in eachcase is the same. Which change do you think will bemore effective? Why?