thank you so much! i still don't get it when my teacher said you had to multiply it first. then subtract it and add something.thank you though.

Answer 1

Was it a problem like this?

How much did Celest pay for a shirt that was originally $20 but was marked 10% off?

100 - 10 = 90

0.9 * 20 = 18

Answer 2

Another way to do that problem?

0.1 * 20 = $2.00

20 - 2 = 18