How to speed up calculating threads in Excel

If Excel is not using threads efficiently, calculations may take a long time to complete. Learn how to speed up calculating threads in Excel.
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Can someone give me the Excel formula for this spreadsheet?

Thanks in advance for any help I may get on this. I am trying to setup a spreadsheet in Excel to do some calculating. The formula I need to put into a spreadsheet is:<BR><BR>COST(which will change) + ...