What rule represents the function below?

(0, 2), (1, 1), (2, 0), (3, 21), (4, 22)

If jon had $4.00 then takes away $2.25, then he should have $1.75 left. $4.00 - $2.25 = $1.75 hope this ; )

Ithink the right answer could be 50%

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