Answer :
You take $279.99 x 75% then subtract what you you get from $279.99. This is is markdowns so for a mark up you add instead of subtracting.
Mark Up: Store pays $40 for shoes and sells to me for $75.calculate the markup in absolute terms 75 – 40 = 35. Narkup rate $40 (x)(40) so markup over the original price is 35 ÷ 40 = x = 0.875. It's a percentage so you need to use the decimal in the correct percentage which is 87.5%
Mark down: Original $425 marked down to $318.75. 425-318.75=106.25 ($106.25) is (some percent) of ($425) so 106.25 = (x)(425) and x = 106.25 ÷ 425 = 0.25. Use decimal to % form which is 25%
Harder than it looks…if you still don't understand let me know.