Here's the question you clicked on:
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If your income is $40,000 and tax is 25% how much would you take home?
what is 25% of 40,000?
subtract that from 40,000 and that's your take home pay after taxes
an alternative is to multiply 40,000 by 0.75 because you are essentially taking home 75% of 40,000 after you subtract off 25% to pay for taxes