The following is the Markets Diary: Closing Snapshot

Day	1	2	3	4
Advances	880	760	960	840
Declines	860	990	790	910
Volume Advancing(m)	580	620	480	510
Volume Declining(m)	670	580	720	520
Yield on Top Rated bond	6.8%	6.7%	6.7%	6.6%
Yield on Intermediate-grade bond	7.4%	7.4%	7.5%	7.6%

a) What is the market breadth for day 1? (example of answer format: 40, or if the number is negative, then -40)

b) What is the Cumulative breadth for 4 days?