Pre algebra

What kind of equation would I need for the total weekly cost if a cart rents for $92 and to buy dry ice every day for $2.50 a pound and you need 10 pounds a week. And you are supplied with bars for $0.55 each and you have to sell them for $2.75 per bar. How would I make this as an equation for weekly costs and explain how the coefficients relate to the situation. I THink I have it but Im not sure

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  1. we don't know how many bars are bought, let's call that number n

    since you want only the "cost"
    Cost = 92 + 10(2.5) + .55n

    profit = 2.75n - cost

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