Acompany's monthly profit increases by $1,000 each month. in january, the profit of the company was $25,000. if x = 0 represents january, which of the following equations represents the profit as a function of time (in months)?

a. y = 25,000x + 1,000
b. y = 1,000x
c. y = 1,000x – 25,000
d. y = 1,000x + 25,000