Aliyah is preparing to expand her IT consulting company.

The current market rate for IT professionals is $58,000 per year. Each employee she hires will also require a computer and equipment that costs $6,000 per employee annually.

Hiring more employees means that Aliyah can provide consulting services to more clients each year. Each client Aliyah has will pay her $15,000 per year.

The number of clients Aliyah can take on depends on the number of workers she hires as shown in the accompanying table. What is the marginal cost and marginal benefit of hiring each worker? Using the Rational Rule to maximize her economic surplus, how many workers should Aliyah hire?

Number of workers Clients per year 0 0 1 11 2 20 3 27 4 32