Widgeon Co$.$ manufactures three products: Bales; Tales; and Wales. The selling prices are: $$55$;$$78$; and $$32,$ respectively. The variable costs for each product are: $$20$;$$50$; and $$15,$ respectively. Each product must go through the same processing in a machine that is limited to $2,000$ hours per month. Bales take $5$ hours to process, Tales take $7$ hours, and Wales take $1$ hour. Which product has the highest contribution margin per machine hour?