Jail and Sail: Alcatraz Tour and Cruise Contribution Income Statement Sales For the Month of July Less variable costs: Admission fees Overhead Hors d'oeuvres Selling and administrative Contribution margin Less fixed costs: Operations Selling and administrative Before-tax profit Income taxes After-tax profit $ x x X X $ x x b. Determine Jail and Sail's monthly break-even point in units. Note: Round your answer up to the nearest whole unit (for example, round 41.2 to 42). units c. Determine Jail and Sail's margin of safety in units for July. units d. Determine the unit sales required for a monthly after-tax profit of $20,000. Note: Round your final answer up to the nearest whole unit (for example, round 41.2 to 42). X units