After the drama club sold 100 tickets to a show, it had $300 in profit. After the next show, it had sold a total of 200 tickets and had a total of $700 profit. Which equation models the total profit, y, based on the number of tickets sold, x?
A. y + 300 = 2.5 (x + 100)
B. y - 300 = 4 (x - 100)
C. y - 300 = 2.5 (x - 100)
D. y + 300 = 4 (x + 100)