Generally, using the square feet of the rented space versus the total home is an accepted method of determining the personal versus rental percent. Since you use the shared space personally as well as using it for rental purposes, you could choose to leave that portion out of the rental calculation to be conservative in the total rental space.
Leaving out the shared space, your calculation would be 110 + 110 + 244 + 672 / 2368
No matter how you decide to do the calculation, be sure to keep some notes with your tax return to explain how it was done.
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