Santana Rey sees that Business Solutions's line of computer desks and chairs is popular, and she is finding it hard to keep up with demand. Santana only has 1,157 direct labor hours available. She must determine the best sales mix given her limited hours. Information about the desks and chairs follows. Required: Determine the best sales mix and the contribution margin the business will earn at that sales mix. (Round per unit amounts to 2 decimal places.)