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a) Kathy's total cost, C, can be calculated by adding the fixed cost (rent) to the variable cost (cost per cup multiplied by the number of cups sold).
The fixed cost is $35, and the variable cost per cup is $1. So the equation for the total cost is:
C = 35 + 1n
Where n represents the number of cups of cider sold.
b) Kathy's revenue, R, can be calculated by multiplying the selling price per cup by the number of cups sold.
The selling price per cup is $2.50. So the equation for revenue is:
R = 2.50n
Again, n represents the number of cups of cider sold.