A sofa regularly sells for $510. The sale price is $423.30. Find the percent decrease of the sale price from the regular price.

(510-423.30)/510 = 17%

To find the percent decrease of the sale price from the regular price, you can use the formula:

Percent decrease = ((Regular price - Sale price) / Regular price) * 100

Let's substitute the given values into the formula:

Regular price = $510
Sale price = $423.30

Percent decrease = ((510 - 423.30) / 510) * 100

Now, let's calculate the percentage decrease:

Percent decrease = (86.70 / 510) * 100

Percent decrease ≈ 17.00%

Therefore, the percent decrease of the sale price from the regular price is approximately 17.00%.