You will have many options to stay in Kathmandu. You could couchsurf, book a dorm, stay in a hostel or hotel. I stayed for Rs 300 Nepali per day when I went backpacking in Nepal.
Bro what about EBC ...should we carry our trekking gear or we will get there ...and estimate cost of solo traveler going there....suggest me cheapest means and of travel and expenditure for whole trail...