Ok, I'm just making this up to see if I understand this correctly or not....this really could be a college level course to understand this, lol.

If I have rooms that are 20 (steps), 40 (bathroom),50 (laundry room), 70 (bedroom), 80 (bedroom), and 240 (Exclusively used livingroom) that makes a total of 500 square feet. If I have another 500 on the upper level of the home, then 500 for the garage bringing my total to 1,500 square feet.

Exclusively used space is 240 (lower-level living room)
240/1,500=16%

Regularly used space is 1,020 (garage, kitchen, 2 bedrooms, bathroom, steps, and laundry room)
1,020/1,500=68%

60 hours per week X 50 weeks=3,000 Hours Worked
3,000/8750=.34

68% X .34 = 23.12% Time/Space Regularly Used + 16% Exclusively Used = 39.12% TOTAL
Keep in mind, I'm making this up just trying to figure it all out. Feel free to give any examples.

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