I wonder how tips factor in to CPI and/or cost of living indices? If the average hotel is $100/night but most people start to tip (in order to pay hotel staff a

I wonder how tips factor in to CPI and/or cost of living indices? If the average hotel is $100/night but most people start to tip (in order to pay hotel staff a living wage) would a one night stay go into the basket as $100 or $120?