Say that thailand has a workforce of 35,709,487 people, each of whom earns an average salary of (equivalent usd) $8,630 annually. if the thai government wants to raise $70 billion in tax revenue, approximately where should it set the income tax rate?

First we have to multiply the number of working people by their average annual salary: 35,709,487 * $8630 = $308,172,872,810. Then we have to calculate which percent of that sum represents $70,000,000,000. r = ( 70,000,000,000 / 308,172,872,810 ) * 100 = 22.7%. Answer; The income tax rate should be approximately 22.7%.