Hi need some help with this question. the subject is in microeconomics

A coffee shop is considering expanding. It currently has 15 workers who share five coffeemakers (big industrial espresso-making machines). A few months ago, the cafe added twocoffee makers, and output increased by 50,000 orders per month. About a month ago, theyadded five workers, and productivity increased by 30,000 orders per month. A coffee machinecosts about three times as much as hiring a worker. Would you recommend they hire anotheremployee or buy another coffee machine? Explain.