Rs.20 per hour for cars, Rs.10 per hour for two-wheelers now.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/parking-costly-affair-south-delhi
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/parking
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/parking-pricing
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-delhi-municipal-corporation