Hi guys,

it's been a really long while since i've done anything but basic math. i don't know how to solve this problem and my textbook doesn't give an example at all. I'm hoping someone can help.

The problem:

Mary and her band receives $550 plus 15% of receipts over $550 for playing a gig. If a club charges a $6 cover charge, how many people must attend in order for Mary and her band to receive $1200?