A new machine comes with 100 free service hours over the first year.Additional time costs $50 per hour.What

A new machine comes with 100 free service hours over the first year.  Additional time costs $50 per hour. What

are the average and marginal costs per hour for the following service hour quantities?

(a) 75    average =                                    marginal =

(b) 125  average =                                                marginal =

(c) 250  average =                                    marginal =