The total profit p, in dollars, from producing and selling x units of barbecue grill is given by the function p(x) = kx − (b + 500), in which k and bare constants. When 120 barbecue grills were produced and sold, the total profit was $15,000 and when 200 barbecue grills were produced and sold, the total profit was $27,000. What is the value of b?

A) 1,850
B) 2,000
C) 2,250
D) 2,500