Adding percentages to a totals matrix

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Hi all,

This is great and shows my totals I need, but need to add underneath the percentages.

The first example would be for Q1 (=Fields!Quarter_Of_Arrival.Value), Month 4 (=Fields!Month_Of_Arrival.Value) where the totals are =Count(Fields!BPT_Uplift_Calc.Value).

so trying to build in a % row also to show 100/61*15 = 24.59%