the marginal social cost of garbage disposed is: MSCd (gd) = 10, where gd is a 50 gallon drum of garbage disposed. The marginal cost of recycling is: MSC (gr) = 2gr, where gr is a 50 gallon can of...

Extracted text: the marginal social cost of garbage disposed is: MSCd (gd) = 10, where gd is a 50 gallon drum of garbage disposed. The marginal cost of recycling is: MSC (gr) = 2gr, where gr is a 50 gallon can of recyclables collected. The marginal benefit for the resident of garbage removed from the residence is: MB(gd, gr) = 800 - 2(gd + gr). At an economically efficient level, how many [] 50-gallon cans of materials a resident shall recycle? (Assuming most of residential waste generated can be recycled, i.e., the resident can recycle as much as desired.)