A cell phone is on sale for $180. It originally cost $200. What percent off is the sale offering?

Answer 1

( 200 - 180 ) / 200 • 100% =

20 / 200 • 100% = 0.1 • 100% = 10%

OR

Difference of prices = $200 - $180 = $20

$20 is 10% of $200