What is the best way to calculate the required manpower for a hotel... assume 100 rooms property with 3 to 4 FNB outlets?

Manpower for a 100 keys Hotel with three to four outlets, ratio 1:2

The best way to calculate manpower to a particular hotel is as follows:

eg. for 100 rooms, 

 If in the larger four & five star hotels (along with the heritage hotels) employ on an average 162 people per 100 rooms, compared to 122 in the One, Two & Three Star Hotels and 58 in the unorganized sector. 

In average for 100 rooms 4*, 5* hotels not more than 1.6 in one room and in 1*, 2*, 3* hotels 1.2 in one particular room. this is in almost all standard.

Not advisable to recruit more staff at once. After3 months can be able to monitor and recruit necessary requirement