An architecture firm charges clients $250 per hour for their services, and they pay their architects an average of $175 per hour. They expect to accumulate 10,000 hours of architecture work this year. Their other costs include marketing and general administrative costs totaling $615,000 per year. What is the firm's profit before taxes?A)$135,000 B)$140,000 C)$115,000 D)$615,000 E)$750,000