Q3. Happy feet buy hiking socks $6 a pair & sells them for $10. Management budgets monthly fixed costs of $ 10,000 for sales volumes between 0 and 12000 pairs. Requirements: (a). Use both the income statement approach and the short cut contribution margin approach to compute the company's monthly breakeven sales in units. (b). Compute the monthly sales level (in units) required to earn a target operating income of $6000. Use either the income statement approach or the shortcut contribution margin approach