Round formula and percentage multiplication error

Here the problem is if you change the multiplication values with any formula, those values will be changed and you will get the sum of new values not the original values obtained after the multiplications.

I think your intention is to show the whole number while keeping the original value intact so that when these are summed, you get the correct result. Right?

If this is the case you may use custom formatting on formula cells with multiplication with #,###, so the whole numbers will be shown in the formula cells but you will get the sum of original values.

To Custom Format the formula cells, select the formula cells, right click and select Format Cells, there on Number Tab, select Custom and in the box where you see General by default, paste the suggested format.

Does this help?