Question 3. Fill in the black and show working out (please show it clearly so I can see a step by step to find the solution)

Consider the following simple principal/agent problem. A firm hires an employee to perform a sales function. Let e denote employee's effort level. Supposeeis not observable by the principal. Assume that every additional unit of effort increases sales by $300, and the employee's marginal cost of effort satisfies the following equation:

if e