Consider the narration below to answer the following question. You may use the Standard Solver to solve the problem. All the LP questions that deal with Stone Age Surfboards are based on this narration, i.e., you may reuse the model and the resulting solution to answer other questions.

Stone Age Surfboards is a small manufacturer of two types of popular low-tide surfboards, the Graystone, and the Lava models. The manufacturing process consists of two departments: fabrication and finishing. The fabrication department has 8 skilled workers, each of whom works 9.25 hours per day. The finishing department has 5 workers, each of whom works a 6-hour shift per day. Each pair of Graystone surfboards requires 3.2 labor hours in the fabrication department and 2.2 labor hours in finishing. The Lava model requires 4.2 labor-hours in fabrication and 3.6 labor-hours in finishing. The company operates 6 days a week. It makes a per unit profit of $40 on the Graystone model and $60 on the Lava model. The company anticipates selling at least twice as many Lava models as Graystone models.

What is the value of slack obtained from the answer report?

• A.

  36.99

• B.

  46.78

• C.

  23.85

• D.

  38.46