The following are the daily returns for both the overall market and for Dexter Inc. What is the cumulative abnormal return on Dexter, Inc., stock for these 5 days?

Date 16-Aug 17-Aug 18-Aug 19-Aug 20-Aug R(m) 1.30% -0.30% -0.20% 0.20% 0.50% Dexter 1.10% 0.20% 0.00% -0.20% -0.30% 0