Green Bottle Coffee is a small coffee shop in Philadelphia that opens every day 7 am through 5 pm. The baristas use a Breville espresso machine to brew the coffee they sell to their patrons. The espresso machine is available all the time that the shop is open. On average, it takes 40 seconds to brew a cup coffee. Baristas need another 30 seconds of preparation time before brewing a cup of coffee, and after it is brewed the machine must undergo some cleaning, which takes a barista 20 seconds to perform. Assume that, on an average day, 300 customers arrive uniformly throughout the time Green Bottle Coffee is open, and each of them buys one cup of coffee.

what is the OEE of the espresso machine?

what is the value-added percentage of the flow time?