A small business offers two types of services: consulting and training. Consulting services are billed at an hourly rate, and training sessions are billed per participant. Last quarter, the business generated $18,000 in revenue. The equation $120H+75P=18000$ represents this situation, where $H$ is the total number of hours spent on consulting and $P$ is the total number of participants in training sessions. Which of the following is the best interpretation of the coefficient $120$ in this context?