How to change background color for only Total rows and Bold Text for Total Rows using Row shelf. order of the columns remains the same. Marks card will not be usable.

please advise how to get highlighted yellow as Grey in the background and Bold text for only Total (It is customized Total)

Attached sample workbook.

How to change background color for only Total rows and Bold Text for Total Rows using Row shelf. order of the columns remains the same. Marks card will not be usable. Please suggest...