You don't have enough information to answer this question. You need to know how many of each of these Alexi and Tony can sell. Even though tacos bring in less revenue per unit, if the demand is great enough, tacos can still be the most profitable overall.
For example: Say they can sell 20 tacos per hour but only 2 cuban sandwiches per hours. They would make $40 per hour in tacos but only $14.50 in sandwiches.
Application, Security and System.
If youre traveling in the US then all you need is an ID with your picture
and if youre traveling outside you need a valid passport
The cost of traveling on a bus, plane or subway is very cheap.
Good Public relations skills lah - IT peeps must communicate with their teammates to come up with new ideas like app or what not what
Scientific background- the discovery of advance science could propel new discovery in tech area