Our business model is different and hence there is no single answer to that. What you will be paying us is mostly the equity in the final product. We prefer to contribute at least as much as others involved in the idea and hence we usually take equal equity. Equity is how we can keep going at a development cost at a fraction of what it would be if we were a traditional software consultancy.
Also, it sometimes helps to remind that we are located in India and thanks to the currency conversion rates, most of our partners from the West love Indian development costs. We do add a little on top of the development cost for the overheads of running and maintaining the office space where the product teams are going to brainstorm and implement the idea.
In short, our cost model can be explained by:
Cost = Discounted Development Costs + Space Maintenance Overheads + Equity