The group of people have breakfast together before going to work. They compute tip to be $9.60, and from that figure out every person's individual share. Everyone counts money, and tosses it in. But it comes up short. One reason is that boss didn't contribute to tip, as he paid for breakfast. Another reason is that one of group, Mr P, refuses to tip as he does not believe in it. To cover to two non-contributors, everyone else has to put in additional 16 cents. Find number of people ate breakfast?