A pie company has two employees who each earn $30 000 a year, and it pays $10 000 rent every year. The ingredients for a pie, including the gas to cook it, cost $10 per pie. If pies are sold at $20 each, the break-even point for the company is:

A) 3 500 pies.

B) 4 000 pies.

C) 6 000 pies.

D) 7 000 pies.

E) 8 000 pies.

The answer was B) 4000 pies. What I need is the steps.

Thank you in advance!