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Well, if 10 Percent of 15 Pounds causes the decimal place to move up one, to 1.5, then 40% is 4 times 1.5. This is 6 Pounds.This can be verified, as Half of 15 Pounds is 7.5 Pounds (50%), taking off 1.5 is 6 pounds (40%).


To do this calculation in equation form, it is best to represent it, as the following:


15 Pounds x 0.4 = 6 Pounds


(40% = 0.4, as it is 40/100)

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12y ago

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