5 Mr. McClellan is hosting a barbeque at his house for his family. When he went to buy charcoal for the grill, he saw that a 4-pound bag of charcoal costs $5.00 and a 7-pound bag of charcoal costs $9.00. If Mr. McClellan want to buy the bag that gives him the best deal, which bag of charcoal would you tell him to buy?​