if a coat is marked down at 80%, and it costs 16 dollars, what was the original price?

If the coat is marked down at 80%, it means that the final price is only 20% of the original price. Let's denote the original price as "x":

20% of x = $16

To find x, we need to divide both sides of the equation by 20% (or 0.2):

x = $16 / 0.2

x = $80

Therefore, the original price of the coat was $80.