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Dion predicted that he would sell 87 art prints. He actually sold 100 art prints. What are the values of a and b in the table below?

Percent Error

Item
Approximate value
Exact value
Error
Absolute error
Ratio
Percent error
Art prints
87
100
a
b


a = negative 13; b = negative 13
a = negative 13; b = 13
a = 13; b = negative 13
a = 13; b = 13