250 dollars
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10% of 500 = 10% * 500 = 0.1 * 500 = 50
Well, to find 90% of 500 dollars, you multiply 0.90 by 500 to get 450, the subtract this from 500. Something that was originally $500 would cost $50 when marked down.
40% of 500 dollars = 500*40/100 = 200 dollars
500 000 000 (five hundred million) represents 1% of 50 billion.
500 Dollars !