Looks good. You can lock a cell so you dont change it accidentally, and to protect it in the formula you can add a $, so F4 would read $F$4. Think $ (s) makes it sticky. The $ before the F protects the F and the $ before the 4 protects the 4. Not needed in this formula but just in case you need it!
I never understood numbers until I used spreadsheets. I love them!
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