Refer to tab 3 of the Project 2 Excel workbook (Price Elasticity) to answer the following questions: 1. Identify the key variable and fixed costs associated with the cardboard box and the metal box. 2. Explain how the marginal cost for the cardboard box can be determined. 3. Explain how the marginal revenue for the metal box can be determined. 4. Explain how you would calculate the breakeven quantity for the metal box