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To figure it out take your regular price and pick a random number (no higher than 100) the random number is going to be your sales discount. Since the price is $75 and the sales price is $33 I'll just pick 56. So you take your regular price and multiply it with 56, so 75x56=4200. You take 4200 and divide it by 100. You'll get the number 42. 42 is the amount of money that is deducted off of the regular price ($75) therefore the sales price is $33, so your answer is 56. See how I did that? Sorry it's hard to explain so I'll give a simpler example: There is a R/C plane that costs $100, you have a coupon that brings the price down to $70, what was the percent discount of the coupon? To figure this one out you guess a number that you think will be the percent discount then multiply it by 100 (regular price). I'll take 30 and 100, so your answer is 3,000. You take 3,000 and divide it by 100 which gives you 30. You then take 30 and subtract it from your regular price (100). If you comes out to be the sales price, $70, then 30% is your answer.