I'm terrible at and quite out of practice with math an have nearly no education in economics and it doesn't look that bad. I've got what I judge to be a decent

I'm terrible at and quite out of practice with math an have nearly no education in economics and it doesn't look that bad. I've got what I judge to be a decent guess at (a) based primarily on knowing what the word "coordination" usually means, my only hang-up with (b) is that I don't know how you get per-capita consumption from the information provided (presumably students in economics do?) and (c) looks a bit tedious but far from impossible. This question does seem more mathy than economicsy, though, in that it looks like a math major could probably do very nearly as well at it as an econ major, if not better.