A $300 tablet is on sale for $234. what is the percent of discount?

I like to think of these like this.

What was the amount of the discount? 300 - 234 = $66 dollars.

66 is to 300 as? is to 100?

This is how that question looks in an equation:

66/300 = x/100 Solve for x by cross multipying.

66 x 100 = 300 x

660 = 300 x

x = 22

The discount amount on the tablet is 22% off the regular price.

Check it!

300 x. 22 = $66 dollars off. 300 - 234 = $66 off.

Yes! It checks.