Cab Rental Estimate

Hello Beautiful people of Sikkim, I am planning to visit Sikkim at start of April. I plan to do 3N GANGTOK -2N PELLING- 2N DARJELLING. I have received a quote for the below iternary for around 32000/- only for a WagonR or Swift. Day 1-Bagdogra -Gangtok Day 2-Gangtok to Tsomgo lake-baba mandir -Nathula Day 3-Gangtok local sightseeing Day 4 -gangtok to pelling via namchi and Rangla Day 5 -pelling sightseeing Day 6- pelling to Darjeeling Day 7- Darjeeling sightseeing Day 8 -drop to airport Is this a reasonable estimate? Or it you have any better option,they are most welcome.