A jacket is on sale of 20%. Now, the sale price of the said jacket is 50 dollars that is already deducted with the 20% discount.
=> 100% - 20% = 80%, thus 50 dollars is the 80% of the original price.
=> 50 dollars / 8 = 6.25 dollars is the 10% of the price.
=> 6.25 dollars * 10 = 62.5 dollars is the original price of the jacket.