There are several information's already given in the question. Based on those information's, the answer can be easily deduced.
Cost of the jacket = $124.99
Percentage of discount given at the beginning = 10%
Amount of initial discount given = (10/100) * 124.99
= 12.499 dollars
= 12.50 dollars
Then
Price of the jacket after the initial discount = 124.99 - 12.50
= 112.49 dollars
Percentage of additional discount = 20%
Amount of additional discount = (20/100) * 112.49
= 22.50 dollars
Total amount saved on buying the jacket = 12.50 + 22.50
= 35 dollars
I hope that this is the answer that you were looking for and the answer has actually come to your desired help.