Trying to figure what to charge for private parties with the hot dog cart

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I am planning on doing private parties to Or open houses and grand opening with my food cart .This kind of set up work like a cater does .So I get the money up front first Say it a birthday party or pet shower People will tell how many people will at there party then I see if they want their guess to have the combo type of meal that 2 hot dogs ,soda and chips. I have special prices for the type of parties.