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. Requirement 1: Using the equation method, solve for the unit sales that are required to earn a target profit of $10,000. unit sales: ??? Requirement 2: Using the formula method, solve for the unit sales that are required to earn a target profit of $15,000. Units sold to attain the target profit