How do i find the cost of an item after a discount?

For example: Lets say you are buys a pair of shoes for $20. It's on sale for 30% off. Put a decimal in front of the amount of the discount. 30 And then multiple. 30 by the amount it is originally 20 Your answer will be 6. Subtract $6 from $20 and that is how much your pair of shows will be with the discount. Answer: $14

U divide it by the the discout