Let's first calculate the total number of hours Steve worked in November, considering he worked 10 hours a day for the entire month.

Steve worked for 10 hours a day for the entire month, which has 30 days in November, so the total number of hours worked in the month is:
10 hours/day * 30 days = 300 hours

Now, let's calculate the extra hours Steve worked in the certain week. He worked 4 hours extra, so the total number of hours worked in that week is:
10 hours/day + 4 hours = 14 hours

Since Steve is paid $80 per hour for the additional hours worked beyond 10 hours in a day, the extra pay for that week would be:
4 hours * $80/hour = $320

Now, let's calculate Steve's salary for that week. His monthly salary is $8400, which is for 300 hours of work. So, his hourly wage would be:
$8400 / 300 hours = $28/hour

Since Steve worked for 14 hours in that week, his regular pay for the week would be:
10 hours/day * 7 days/week * $28/hour = $1960

Adding the extra pay for the additional hours worked, the total salary for that week would be:
$1960 + $320 = $2280

Therefore, Steve's salary for that week would be $2280.