First, figure out how much Bill has before he pays property taxes: $40,000 + $2,000 = $<<40000+2000=42000>>42,000
Then, figure out how much Bill has before he pays sales taxes: $42,000 + $3,000 = $<<42000+3000=45000>>45,000
Next, figure out what percent of his salary Bill keeps after income tax: 100% - 10% = 90%
Now we know that .9g = $45,000, where g is Bill's gross salary
Now we can divide both sides of the equation by .9 to find that g = $50,000
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