Exercise

Cross-selling products

The small grocery store has decided to cross-sell chewing gum with either coffee, cereal, or bread. To determine which of the three items is best to use, the store owner has performed an experiment. For one week, she sold chewing gum next to the register and recorded all transactions where it was purchased with either coffee, cereal, or bread. The transactions from that day are available as a list of lists named transactions. Each transaction is either ['coffee','gum'], ['cereal','gum'], or ['bread','gum'].

Instructions

100 XP

Count the number of transactions that contain coffee and gum.
Count the number of transactions that contain cereal and gum.
Count the number of transactions that contain bread and gum.