Required: 1. What is the contribution margin per unit? Round your answer to the nearest cent. What is the contribution margin ratio? Round your answer to two decimal places. (Express as a decimal-based answer rather than a whole percent amount.) 2. Calculate the sales revenue needed to break even. Round your answer to the nearest dollar. 3. Calculate the sales revenue needed to achieve a target profit of $275,000. Round your answer to the nearest dollar. 4. What if the average price per unit increased to $21.50 ? Recalculate the following: a. Contribution margin per unit. Round your answer to the nearest cent. b. Contribution margin ratio. Enter your answer as a decimal value (not a percentage), rounded to four decimal places