choices, meat, cheese, topping. and if they wanted deli salad on the side. >> at the 50-year-old lunch shop which she owned and operated since 2007, she turned everything into a number. >> opening 19 minutes, made 266 bucks. who is visiting my business. big slice of business is the 25 to 34-year-old demographic. that's the biggest demographic. >> yeah, lots of data in that store. >> big data expert is at vancouver based open tech. >> how much did the sandwich cost, who bought it. >> he says small business owners can learn from data if they ask the right questions. >> how many times have they bought it. where did the meat come from. how much did the bread cost. >> those are the questions she asks every day. >> last 30 days, paid 121 bills for total of $50,523.