Krissy predicted that she would sell 65 sweaters. She actually sold 85 sweaters. What are the values of a and b in the
table below?
Percent Error
Item
Sweaters
Approximate value
65
Error
Absolute error
Ratio
Exact value
85
Percent error
a
b
O a=-20,b=-20
O a=-20; b=20
O a = 20,b= -20
O a= 20; b= 20