This appears to be a homework problem. People here are generally happy to help you once you already have some Julia code written (maybe with a few bugs that you can’t figure out how to get around), but as a matter of policy, we will not solve your homework for you.
As @odow suggested above, you should work through a JuMP tutorial and then attempt to solve this on your own. Once you reach a point of confusion, feel free to ask for help, but be aware that we’re all volunteers, so the best way to get quick and insightful answers is to make sure you ask your questions well. For that, please refer again to odow’s post, specifically this link: Please read: make it easier to help you.