Am I doing this correctly? I feel like #3 is incorrect. Definitely need help on #4 & #5

ROCK RIDGE RAFTING (Breakeven) white water rafting. The company has sales of $3,000,000, variable costs of S750.000, and fixed costs of $1,800,000 Rock Ridge Rafting is a company that manufactures many outdoor recreation products, especially those Required: 1. Compute the contribution margin ratio 2. Compute the variable cost ratio. 3. Determine the sales volume needed breakeven. 4. Compute the margin of safety ratio. 5. Compute the net operating income as a percentage of sales. $,000 ooo