45 of 25 is 180%
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1.8
0.5556
25 out of 45 = 56% = Failing grade
33.75. To calculate percent off, convert the percent into a decimal. So 25 percent = .25 as a decimal. Then multiply this by 45. .25*45 = 11.25. Then subtract this from 45. 45 - 11.25 = 33.75. You can also think of 25% as 1/4, and divide 45 by 4.
25% of $45 is $11.25. $45 minus $11.25 is $33.75