Suppose that Larimer Company sells a product for $20. Unit costs are as follows: Direct materials $2.10 Direct labor 1.25 Variable factory overhead 2.00 Variable selling and administrative expense 1.05 Total fixed factory overhead is $56,590 per year, and total fixed selling and administrative expense is $38,610. Required: 1. Calculate the variable cost per unit and the contribution margin per unit. 2. Calculate the contribution margin ratio and the variable cost ratio.