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The input parameter n is the number of hotdogs a customer wants to buy. The price per hotdog (90 if n >= 10, 95 if n >= 5, 100 if n < 5) depends on this number. In order to return the total cost of the hotdogs, we multiply the number of hotdogs (n) by the price per hotdog.
Nice and simple! Question, and maybe I'm not understanding the kata correctly ("return a number that the customer need to pay how much money").. but why is the number of customers being multiplied by the price?