usually car park , aircon ledge, private lift lobby = 0,5 weight factor
so if you car park =12m2 and aircon is 4m2 , the share unit is 6 and 2 respectively

when your condo build up is 100m2 so the share unit is 100; your total share unit will become 100+6+2 = 108 share unit

108 share unit x what ever service fee the JMC /developer has calculated

service fee = total expense (as per budget) divide by total share unit of the condo
if the total annual expense is RM2mil and total share unit is 100,000
service fee = RM2,000,000/100,000 = RM20 per share unit per annum
so your service fee = RM108 x 20= RM2160 per annum or RM180 per month

apply to all under the new strata act where service fee is base on share unit (not sf)