A producer of fixed proportion goods Beef and Leather (goods that are complements in production such that QB=QL - each cattle raised and slaughtered for beef yields its skin/leather as well) has marginal costs and marginal revenues of MC = 12Q, MRB=54-6QB, MRL=126-12QL. How many units of cows should be raised and slaughtered?
a.8.25
b.6
c.5.25
d.3