Question

The cost of a jacket increased from $90.00 to $108.00. What is the percentage increase of the cost of the jacket?

Answer 1

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:
 $x = (108/90) * (100) x = 120$
 Then, the percentage of increase is:
 $120 - 100 = 20$
 Answer:
 The percentage increase of the cost of the jacket is 20%