2.3 Mark-Up and Discount

7.RP.3. Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error.

Discount Practice

http://www.mathplayground.com/mathatthemall2.html

http://www.mathgoodies.com/lessons/percent/sale_price.html - you have to scroll all the way to the bottom of the site.

http://www.aaamath.com/mny84_x4.htm