Abusiness 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