Not the same

Imagine you've been hired as the manager of a firm producing a certain product $x.$ The following schedule shows the total production per week of product X $.$ Additionally, assume each unit of product X sells for $$10$ per unit, workers can be hired in a competitive labor market for $$500$ per week, and the rental price of a unit of capital is $$R$ per week

$\backslash$table$[[$Labor $($L$),$Capital $($K$),$Quantity $($Q$)],[0,5,0],[1,5,40],[2,5,105],[3,5,170],[4,5,245],[5,5,325],[6,5,410],[7,5,500],[8,5,595],[10,5,695],[11,5,760],[12,5,810],[13,5,855],[14,5,],[15,5,915]]$

a$.$ How many workers should be hired? To answer this question, append to the above table three new columns similar to columns $(3),(4)$ and $(5)$ of Table $5-2$ in your textbook. Explain your final answer!