Tasha purchased a $40 shirt on sale for $30 how much of a discount did tasha recieve

To figure out how much of a discount she received, you use the following equation:

Percent Off = 1 - (minus) Sale Price/Original Price (It would be Sale Price over Original Price ((written like a fraction)) but I can't write it like that here).

So, using that formula, the equation would be:

Percent Off = 1 - $30/$40

If you do the math correctly, you should get the percent off is 25!

Tasha received a 25% discount in order to get a 40$ shirt for $30.

Hope this helps! :)