Dol lar sales volume to produce operating income o $864,0 472,000 Extra Credit -10 points Pet Park International sel ls cat food and dog food. Its monthly fixed costs average $623,000. Cat food sates remaining 10%. The company present 90% of the company's total revenue. Dog food sales constitute the has provided the following information expressed on a per-case basis: Selling Price Contribution Margin $14 Cat Food $40 DogFood $30 $11 Compute the following: The total monthly sales revenue required to break-evern The total monthly sales revenue required to earn an operating income of $135,000 The company's margin of safety at a monthly sales level of $2,500,000