Manhattan Brewery produces lager and ale $($types of beer$).$ Lager sells for $$50$ per barrel,

and ale sells for $$70$ per barrel. Producing a barrel of lager requires $30$ pounds of malt

and $10$ pounds of hops. Producing a barrel of ale requires $20$ pounds of malt and $20$

pounds of hops. The brewery has $600$ pounds of malt and $250$ pounds of hops available.

How can Manhattan Brewery earn the most revenue?