Mantle, Inc. produces two types of wooden mallets, Ash and Oak, in its Miami factory. Data relating to the mallets are given below: Product Ash Oak Unit selling price $30 $28 Variable manufacturing costs $11 $12 Variable selling costs $1 $1 Minutes required per unit 20 15 Demand per period 1,200 1,600 A total of 600 hours are available in the Miami facility. How much of the Ash wooden mallet should be produced to maximize Mantle's operating income?