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Anonymous
To calculate this, we multiply the $20 by the 40%. Forty percent is written as 0.40 (when calculating with percentages, you move the decimal over two places).
20 x 0.40 = 8
40% of $20.00 would be $8.00.
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20 dollars
40 percent of 50 = $20
32 dollars
20$ 80c
40% of 49 dollars = 49*40/100 = 19.6 dollars.