A company sells one of its products for $11.80 per unit. Its fixed costs are $690.00 per month, and the variable cost per unit is $4.90. (a) The contribution margin per unit is $ (rounded to the nearest cent). units per month (b) The break-even volume, i.e., the level of output at break-even, is (If necessary, round up to the next whole number of units.) (c) The profit at a monthly output level of 420 units is $ (rounded to the nearest cent)