EXERCISE 3-7 Compute the level of Sales Required to Attain a Target Profit [L03-61 Lin Corporation has a single product whose selling price is $120 and whose variable expense is $80 per unit. The company's monthly fixed expense is $50,000. Required: 1. Using the equation method, solve for the unit sales that are required to earn a target profit of $10,000. 2. Using the formula method, solve for the unit sales that are required to earn a target profit of $15,000