A sofa regularly sells for $810. The sale price is $680.40. Find the percent decrease of the sale price from the regular price

To find the percent decrease, we need to find the difference between the regular price and the sale price, then divide that by the regular price and multiply by 100%.

Regular price - Sale price = $810 - $680.40 = $129.6

Percent decrease = (difference / regular price) x 100% = ($129.6 / $810) x 100% = 0.16 x 100% = 16%

The percent decrease of the sale price from the regular price is 16%.