2 machines, 1 location, card readers installed and stocked

A cold drink and snack machine on location with about 100 employees. Each machine is equipped with a Nayax card reader. No equipment has any issues that I know of. Revenue is about $200 a month. The employees are looking for healthy snacks and it doesnt fit well into the rest of my route so I havent optimized on the selection. Someone who has a good investment in sugar free, high protein, etc drinks and snacks would be able to easily turn this into a $500/mo location.