first calculate the value of increase e.g. if 100 increases to 110 then the increase is 10.
Then you calculate the percentage increase by diving the increase by the original number then multiply by 100 i.e. (10 divided 100 = 0.1, multiplied by 100 = 10%)
or (10/100)*100
same for % decrease but in reverse.
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The increase from 2.75 to 4.50 is: 63.64%
The answer is 164% I.
percent increase and decrease is how much percent it had increased from a certain amount of number, like discounts and markups
The percent in the decrease of 25 to 20 = 20%
88.3721% decrease.