Answer questions 15 to 17 on the basis of the attached marginal revenue product diagram. This diagram shows the marginal revenue product (MRP) of workers per hour at Sam's Sawmill, a competitive lumber firm that hires workers from a competitive market,

How many workers will Sam's Sawmill hire when the wage rate is $15 per hour?

Suppose that Sam's Sawmill uses a new technology that increases the productivity of its lumber workers. How will the new technology affect the quantity of workers the Sawmill is willing to hire?