2.25
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Not hard at all. To change a percent to a decimal, simply move the decimal to the left two places:225.0% = 2.25
-2.25 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is -225/100 which can be simplified, if required.
225. If 100% of 100 is 100, then 225% of 100 is 225.
225-80 = 145
225