A website is offering a promotion, during which customers can buy up to 100 photos for a flat fee. The cost per photo varies inversely with the number of photos a customer buys, as shown in the table below. What function models the data?

Number of photos (n)

20

40

50

80

Cost per photo in cents (c)

5

2.5

2

1.25

A. nc = 25
B. nc = 50
C. nc = 100
D. nc = 400