Answer:
99%
Explanation:
10% = 0.1
Take 550 times 0.1 = $55
So, 10% of $550 is $55
Because it is a discount, so we subtract it
550 - 55 - $495
Then we know it marks up by 10%
10% of 495 is $49.50
495 + 49.50 = $544.50
Then take 544.50 divided by 550, then times 100% = 99%