If i have a worth P300 ingredients for making leche flan,how much should my profit be?

some of my friends always order leche flan from me because they said it's smooth and delicious,so i'm making it a business,lol!if the P300 includes the eggs,milk,sugar,vanilla/lemon extract,etc,how much should i sell it after i make it?i don't want to overprice,i want a profit that's just right.however,this doesn't include the gas that i consume whenever i cook it.thanks for the advice in advance. =)