A company sells one of its products for $13.40 per unit. Its fixed costs are $1,356.00 per month, and the variable cost per unit is $2.10. (a) The contribution margin per unit is $ (rounded to the nearest cent). (b) The break-even volume, i.e., the level of output at break-even, is units per month. (c) The profit at a monthly output level of 547 units is $ (rounded to the nearest cent)