Original price = $33,750
Marked down price = $29,700
Amount of decrease = $33,750 - $29,700
= $3050
What you are trying to find is the percentage of "amount of decrease" as compared to "original price" ("original price" will be your 100%).
Amount of decrease ÷ original price = $3050 ÷ $33,750 <This will be your ratio>
To find percentage decrease, $3050 ÷ $33,750 × 100 = 9.04% (rounded off to 3 significant places)
Hope this helps! :)