Please help and explain if you can, I'm lost. Thank you!

Break-Even Sales: Sales for Target Profit Health-Temp Company is a placement agency for temporary nurses. It serves hospitals and clinics throughout the metropolitan area. Health-Temp Company believes it will place temporary nurses for a total of 21,500 hours next year. Health-Temp charges the hospitals and clinics $100 per hour and has variable costs of $88.00 per hour (this includes the payment to the nurse). Total fixed costs equal $247,320. Required: 1. Calculate the contribution margin per unit and the contribution margin ratio (express the ratio as a decimal rather than a percentage). If required, round your answers to two decimal places. Contribution margin per unit $ Contribution margin ratio 2. Calculate the sales revenue needed to break even. $ 3. Calculate the sales revenue needed to achieve a target profit of $74,400. $ 4. What if Health-Temp had target operating income (profit) of $91,200 ? Would sales revenue be larger or smaller than the one calculated in Requirement 3 ? By how much