Juan makes two types of wood clocks to sell at local stores. it takes him 2 hours to assemble a pine clock, which requires 1 oz of varnish. it takes 2 hours to assemble an oak clock, which takes 4 oz. of varnish. juan has 16 oz. of varnish in stock, and can work 20 hours. if he makes $3 profit on each pine clock and $4 on each oak clock, how many of each type should he make to maximize his profits?