If you are not going for Jungfrau (will get 25% around discount if you have swiss rail pass) and you are having free breakfast in your hotel, less on alcohol consumptions then 50k is doable. If you want to eat healthy during your travel then 60k plus.
It will be a lot more than 50k even on the tight budget. You will spend 30k just for the swiss rail pass. renting a car is cheaper option if you are not alone and you can drive with indian driving license. As fas from my experience you will need 1 lakh INR even on a tight budget. Go check my profile for trips in europe on a budget for expenses and where to book tickets from. Switzerland will be published soon.
If you plan to stay in Zurich then,
Trip to Jungfraujoch with Interlaken:- 15-17K per person
Trip to Titlis-12K per person
Trip to Mount Pilatus-12K per person
Trip to Black Forest in Germany and Rhine Falls (check Grayline.com and the tour starts from Sihlquai bus terminal in zurich if you intend to stay there - Rs 7-8k per person You may choose which ones you want to go on...usually indians skip mount pilatus.