'I want to subtract the values ​in datagridview3 row 0 by their total mean, and display the results in datagridview4. but the result doesnt match

please to help me i am still newbie, this is my code, and i can't solve it. I want to subtract the values ​​in datagridview3 row 0 by their total mean, and display the results in datagridview4. but the result doesnt match.

the code enter image description here

datagridviewsubtraction


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