How much nutella should i put on 4 crepes? i need help!?

i have to do a presentation on crepes and i am passing out crepes to 32 people in my class. what should i fill them with? (im getting the already made crepes but they arnt filled). it cant be to expensive...i wanted to put nutella on them and bananas. how much nutella would i need for 4 crepes (1 table, there is 8 tables with 4 people each on them) idk what to do!