it was originally "x" or that is 100%. We also know that she found it for 51 bucks, and that those 51 bucks are 100% - 92% = 8% of the original price, so
51 x 1.92 = 97.92. if it’s marked down, divide the percent by 100 and add one. then multiply this number with the discounted number to find the original price.