Allison wants to buy a skirt that has a regular price of $30.
• The skirt is on sale for 1/5 off the regular price.
Allison has a coupon that will take 1/10 off the sale price.
• There is no sales tax on clothing.
If Allison pays with a $50 bill, how much change will she receive?
(Note: Express the answer as dollars.cents.)