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That formula seems to work fine for me, assuming that's the result you're looking for. The row rule i created was to apply the formula when the Desc = Total. It did need require that I configured the "Default Table Settings" setting the "Table Border" to "No" in order for the bottom one to have the larger line when exporting to Excel.
If you're still unable to get this to work, I suggest sharing an example of your workflow that we can investigate and either fix or let you know what the issue is.