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 Approximate value Exact value Error Absolute error Ratio Percent error Sweaters 65 85 a b a = negative 20; b = negative 20 a = negative 20; b = 20 a = 20; b = negative 20 a = 20; b = 20