Cost of staff in India (Mumbai)

I've been trying for weeks now to find a way to compare the salaries of staff in India, and it seems like it's the biggest taboo ever.

Could anyone help me and tell me what's the average price for :
Driver + car per month in Mumbai
Maid
Cook
Dhobi Ghat

If you feel more comfortable sending me an email to keep it private please do so: Protected content

thank you for your help,
Sophia