How to make a single line is not calculated?

How to make a single line is not calculated?

math:"[$r,:2]*(1-[$r,:3]/100)"

so:

math:"[$r,:2]*(1-[$r,:3]/100)"

How to make a cell is not calculated in the same row?

Currently there is no way to override column level settings. If you have math formula defined for the column, it will be applied to all cells in the target column.