Well lets see matkat.
Last I recall a F/O made 173 per day.
That times 30 comes to 5,190.
Less than your figure of 5,850.
You also get 10 days off at home a month with the same pay, poor old F/O gets this subtracted from his pay of 5,190.
So if for say he takes 10 days off a month such as you then his salary gets reduced by 1,730.
Making his bring home a month 3,460.
Most F/O only go home every 3 months otherwise they cannot afford it.
Do you understand this or should we break it down more for you.