Last Spring, several of the Mt. Hood Community College (MHCC) jazz groups held a joint concert. Tickets sold for $8.00 to the general public and for $5.50 for students and staff. Ticket sales brought in $2,582.50. If 390 people attended the concert, how many were MHCC students and staff, and how many were general public? Using the variable p for the general public, and s for students/staff, write a system of equations to determine the breakdown of attendees.