Model and solve the following question with Branch-and-bound algorithm. At each step show your work on paper and solve with Excel. Make sure you show each step on Excel. You are a very popular vlogger and you make videos for Youtube and Twitch. Each week, you can only work for 90 hours and you have only 36 GB of memory space. Each video on Youtube requires approximately 8 hours of your time and 2 GB of memory space. Each Twitch video requires 10 hours of labor and 6 GB space. Each Youtube video earns approximately $400K and each Twitch video earns approximately $600K. You need to decide on how many of each type of video you should record per week to maximize your earnings