Ron is a car salesman. He earns a monthly wage of $1,000 plus a commission equal to 3% of the total price of the cars he sells. If p is the price of the cars Ron sells in a month, which equation represents Ron's total monthly income (r)?

A. r × 0.03p = 1,000

B. r = 0.03p × 1,000

C. r = 0.03p + 1,000

D. r + 1,000 = 0.03p