What is the formula for F9 in Open Office?

If F5 is $1,281.52 is my income
   F8 is  $  705.84 is my subtotal of columns 6 plus column 7
   F9 is  $ 1,352.36 is my total 

What is the 

2021-04-07T07:31:51Z

What is the formula for F9 in Open Office? 

2017-04-11T00:37:33.809Z

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