I need the answers in clear steps please

Chisholm Company's projected profit for the coming year is as follows: 1. Compute the BEP in units. 2. How many units must be sold to earn a profit of $2,700,000 ? 3. Compute the contribution margin ratio. Using that ratio, compute the additional profit that Chisholm would earn if sales were $300,000 more than expected. 4. For the projected level of sales, compute the margin of safety in units