Answer:
So the Percentage Increase in Price would be 13%
Explanation:
Given:
Old Price of jacket = $80.00
New Price of Jacket = $ 90.40
To Given:
Percentage Increase = ?
Solution:
WE have to find the Percentage Increase
By the formulas we know that 
Percentage Increase 
%
Now we will find the difference in values
Difference = New Value - Old Value
 = 90.40 - 80.00
 = $ 10.40
Now the formula we have is
Percentage Increase 
%
Putting in the values
Percentage Increase 
%
 
%
 = 13%
So the Percentage Increase in Price would be 13%