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.
The cost of the Char Dham Yatra per person can vary depending on the mode of travel, accommodation, and other factors. On average, it can range from 18,000 to 50,000 Indian Rupees or more. It's essential to plan your budget according to your preferences and travel arrangements. Check details here - https://www.bizarexpedition.com/promo-chardham If you're coming from any other place for char dham yatra, then this link might help https://www.bizarexpedition.com/promo-chardham-yatra-from-haridwar