Cab - 12 days * Rs. 4000 (Indigo/Dzire) = 48000
Hotel - 12 days * Rs. 5000 (2 people) = 60000
Food - 12 days * Rs. 150 * 3 meals a day *2 people = 11000
Toll + Pandit Dakshina + Entry fees + Sundries = 5000
Doesn't include Flight cost to D.Dun/Doli/Khacchar/Heli to Kedar or Yamunotri (I'm assuming a trek). Plan for around 125k for 2 people at peak seasons with decent accommodation qualities, Dehradun to Dehradun As a comparison, it costs 99k per person to do a full chardham trip Dehradun to Dehradun via helicopter - if you don't care about the landscapes or the journey to the dhams itself, the heli package is perhaps worth it.