salary

Which month?

800 divided by 11 times by the number of days in the month.

Since it is a 'salary' and not a 'wage', I expect you get paid the same amount each month.

365 days/year   divided by 12 yeilds an 'average month of  30.41 days

(30.41 days/month)  / (  11 days/ $800 ) =  $2212.12 per month

This is approximate as we are dealing with averages and an unknown 11 day period

I know people on salaries that are paid monthly.

They get paid for the number of days that are in the month.  

Hence they gets less pay in Feb than in any other month.

Hence the 'averages'  and approximate..