Final answer:
To find the percentage decrease, subtract the new price from the original price, divide the result by the original price, and then multiply by 100%.
Step-by-step explanation:
To find the percentage decrease, we can use the formula:
Percentage Decrease = (Original Price - New Price) / Original Price x 100%
In this case, the original price was $180 and the new price is $81. Plugging these values into the formula, we get:
Percentage Decrease = ($180 - $81) / $180 x 100% = $99 / $180 x 100% = 55%
So, the percentage decrease in price is 55%.