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Percent- multiply amt x4.5%.

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12y ago
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Q: How do you find 4.5 of an amount?
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An item sells for 45 after a 20 percent discount find the original amount?

$56.25$45 is 80% of the original price45/.80=56.25


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I think you subtract the new amount from the original amount and then move the decimal over twice to the right of the number and that's your percent. :)


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Was that supposed to say "9/10 of a sum of money is 45"? If so, then the answer is "50". Divide 45 by 9/10, or 0.9. So 45/.9=50


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If you are asking "what is the % increase if you go from 40 to 45", then subtract and divide by the original amount. 5/40 = 1/8= .125 = 12.5%


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What is 45 percent off of 75.00?

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What do you multiply to decrease an amount by 45 percent?

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I have 45 gals of water at 96 degrees to get this i had hot water at 120 degrees and cold at 57 degress how many gals of each did it take to make this amount at that temperature?

To solve this problem, you can use the principle of mixtures. Let x be the amount of hot water at 120 degrees and 45-x be the amount of cold water at 57 degrees. Set up an equation based on the conservation of energy (Q_hot + Q_cold = Q_final) where Q = mc∆T. Solve for x to find the amount of hot water needed, and hence the amount of cold water.