> Flat Rate Pricing

> This also applies to software development. If an e-commerce application you are building will bring in $500,000.00 in sales in the next year, then charging 10% to 20% of this amount is acceptable. The same goes with feature implementation. If your feature will save them $200,000.00 in the next year, price with that in mind vs the hourly rate.

And how do you know what amount of money they'll make or save? Do you estimate it yourself? Do they tell you?