I WANT TO HAVE A NACHO STAND/BOOTH FOR A FESTIVAL HOW MUCH $ CAN I MAKE?

HI WE ARE HAVING A FESTIVAL AND IM RENTING A BOOTH FOR 300 PLUS SUPPLIES ...ITS MY FIRST TIME DOING THIS BUT HOW MUCH SHOULD I SELL THE NACHOS FOR I HEARD THAT LIKE 3000 PEOPLE ATTEND ....