You start a coffee stand and offer the following four basic items: cappaccino, restretto, americano, and glass of water. If a customer buys a cappuccino, the transaction takes 2.5 minutes. If a customer buys a ristretto, the transactiontakes 1 minute, if they buy an americano, it takes 1.5 minutes, and if they buy a glass of water it takes 0.5 minutes. In an average 24 hour day in which your stand is open, you see 60 customers who buy cappuccino only, 100 customers buy a ristretto, 20 customers buy Americano, and 100 buy water. 50 buy cappuccino and water together, and 100 buy ristretto and water together. Transactions involving more than one item take the sum of the individual item times. Supply daily demand rate, capacity, and utilization figures at the customer level, i.e. not for each individual product. So your result will be in "customers/unit time", where a customer may be purchasing any of the items/combinations outlined above.