An employer faces two types of employees. regular workers are 70% of the population and generate $100,000 in productivity. exceptional workers are 30% of the population, and generate $120,000 in productivity. employees know their types, and reject salaries below their productivity. if the employer offers a salary equal to the average productivity in the population, what will be the employer’s per-employee profit? select one: a. -$10,000 b. $0 incorrect c. -$6,000 d. $4,000