Math - Combining Functions

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Kathy has a small business selling apple cider at the farmers' market. She pays $35 per day to rent her space at the market, and each cup of cider costs her $1. She sells the cider for $2.50 per cup and brings enough cider and cups to sell a maximum of 200 cups in a day.

Write an equation to model each of the following for 1 day, as a function of the number, n, of cups of cider sold.
a)Her total cost, C
b)Her revenue, R

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