A business consultant earns a flat fee for his work as well as an hourly fee. He charges his clients at a rate of $75 per hour. In one week, he billed a client $1,800 for 20 hours worked. Which of the following equations describes the pay for the consultant in terms of hours worked? A. y = 20x – 300 B. y = 20x + 300 C. y = 75x – 300 D. y = 75x + 300