Is 4/7 the correct % for the home office/self-employment expense for the following: Self-employment=4 days/wk; Employment job (work from home)= 3 days/wk?

All of my work is home-based, so I need to know how much home-office expense can be claimed for my self-employment. I also work from home 3 days per week for a firm & receive a T4 for that work. I fill out T2200 for that work.  Thank you!