Aerodynamics is a company specializing in the production of bicycle shirts. It has a fixed capital stock, and sells its shirts for $20 each. It pays a weekly wage of $400 per worker. Aerodynamics must maximize its profits by determining the optimal number of employees to hire. The marginal product of each worker can be inferred from the table below. Determine the optimal number of employees. [Hint: you must determine the VMPL schedule, having first computed the MPL.]