Jhon buys 8 packs of cookies at the grocery store. The cookies are on sale for 50 cents off per pack. He spends $20. Which equation can be used to find the original costs of a box of cookies, c?
8( c + 0.50) = 20
8c - 0.50 = 20
8 ( c - 0.50) = 20
9 - 0.50c = 20
The correct equation would be:
8( c - 0.50) = 20