A seminar series has set up costs of $3000. A rent per event of $1000, plus a variable cost of $30 per attendee for food, supplies, and refreshments. The price of the seminar admission is $100 per person. What is the break even in a) units(people) and b) dollars for each seminar? C) How many paying attendees must register and pay to profit $15,000 in an event.