An index model regression applied to past monthly returns in Fords stock price produces the following estimates, which are believed to be stable over time:

r_F = 0.1% + 1.1r_M

If the market index subsequently rises by 8.4% and Fords stock price rises by 8%, what is the abnormal change in Fords stock price? (Negative value should be indicated by a minus sign. Do not round intermediate calculations. Round your answer to 2 decimal places. Omit the "%" sign in your response.)