Okay, here we have this:
Considering the following equation:
Sale Price=Original Price*(100%-Percentage discount)
Replacing we obtain:
$1149=$1549*(100%-Percentage discount)
$1149/$1549=(100%-Percentage discount)
0.7417=100%-Percentage discount
Percentage Discount=100%-0.7417
Percentage Discount=1-0.7417
Percentage Discount=0.2583
Percentage Discount=25.83%
Finally we obtain that the discount percentage is 25.83%.