Molly wants to buy a dress that costs $20. She has a coupon for 40% off, and there is a 10% sales tax. How much will she pay altogether?
1. What is the 40% of $20? Show your work.
2. After using the coupon, what is the sale price of the dress?
3. How much is the 10% tax on the sale price? Explain how you found your answer.
4. After tax is added to the sale price, how much does Molly pay for the dress?