The fastest way would be contracting. Creating a webapp to earn that much a month could take a long time. I've had my webapp for a while and I'm not earning th

The fastest way would be contracting. Creating a webapp to earn that much a month could take a long time. I've had my webapp for a while and I'm not earning that much a month yet. Building a webapp is the easy part, marketing and getting paying customers is where the hard work is.