after a campus pub increases its output from 5 kegs of beer per day to 9 kegs of beer per day, its total resource cost increases from $225 per day to $450 per day. instructions: enter your answers rounded to two decimal places. a. what is the marginal resource cost per day of the additional kegs? $ b. assuming the pub is using its resources in a profit-maximizing way, what is the marginal revenue product per day of the additional kegs? $