I want to know how much does it cost, on the average, to a U.S.
sponsor to make a person from a foreign country a lawful permanent
resident in the United States, assuming the the U.S. sponsor pays all
costs. Please give me an single average that averages the different
methods used by U.S. sponsors, proportionally, through employment,
marriage, or other, accurate to $5,000. Please specify whether you
have included travel costs in your estimate.

If you could, give me a breakdown of how you calculated your estimate.