please show formulas used and explain please

3. Using the following table, how many units must be sold to achieve a target profit of $800,000 Number of units produced in 2015 2,500 Number of units sold in 2015 2.000 Selling price per unit $1,000 Expenses Direct Materials per unit $500 Direct Labor per unit $100 Variable Manufacturing Overhead per unit $50 Fixed Manufacturing Overhead per year $100,000 Variable Selling and Administrative Expenses per $10 unit Fixed Selling and Administrative Expenses per year $50,000 4. Calculate the contribution margin ratio using the following information: Sales $60,000 Variable Expenses $35,000 Fixed Expenses $20,000