answer all parts to the problem please and show work. thanks!

John Rhoades, owner of Rhoades Inn, has requested your assistance in analyzing his fiftyroom rooms-only property. He provides you information as follows: 1. The average rooms sales price is $30. 2. Monthly fixed costs equal $20,000. 3. His variable costs per room sold equal $10. Required: 1. Determine the Rhoades Inn's breakeven point in revenue. 2. If revenues equal $450,000, what is the Rhoades Inn's margin of safety in revenues and rooms sold? 3. If John desires his property to generate a pretax profit of $100,000, how many rooms must be sold? 4. What is the occupancy percentage for the Rhoades Inn when pretax profit earned is $100,000