For this case we can make the following rule of three:
90.00 $ -----------------> 100%
$ 108.00 ---------------> x
From here, we clear the value of x.
We have then:
[tex]x = (108/90) * (100)
x = 120[/tex]
Then, the percentage of increase is:
[tex]120 - 100 = 20
[/tex]
Answer:
The percentage increase of the cost of the jacket is 20%
