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Which formula should be used to determine the total cost

The wedding photographer for the Smith/Jones wedding charges $1,000 for her preparation and first 60 prints. The cost is $2.00 per photo for photos beyond the first 60. Which formula should be used to determine the total cost, C, as a function of the number of photos, p, that are purchased, assuming at least 60 are purchased? 

a. C = 1000 p + 2 

b. C = 1000(2p – 60) 

c. C = 1000 + 2(p – 60)

Please explain your answer. Thanks! 

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