Pokemon Inc. produces computer chips. The production budget for the next four months is: July 4,000 units, August 6,000, September 6,500, October 7,000. Each chip requires 1.2 hours of unskilled labor (paid $10 per hour) and 2.1 hours of skilled labor (paid $20 per hour). How many total labor hours will be budgeted for September?

A. 21,450

B. 7,800

C. 13,650

D. 8,125