Write a function rule to describe the the amount of change c (x) you get from a $20.00 bill if you buy x pounds of candy at $2.25 a pound.

c (x) = 20x + 2.25

c (x) = 20x - 2.25

c (x) = 20 - 2.25x

c (x) = 20 + 2.25x

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