With this question. i need with proportional relationships

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

Nikita wants to apply for student aid to fund her college education. arrange the steps involved in nikita’s application for financial aid