How to calculate Margin as a row

[Archie_ZHANG]

I wanna calculate Contribution Margin% at the bottom of the Matrix as a row, and hope it can shown as %, like 80%, rather than XXM. It's quite challenge to you, hope master help on it, thanks!

Here is the view before add Margin%. Margin % = (Booking - GTM Expense ) / Booking. But the dataset looks like the second screenshot, booking/Expense/ Contribution Margin in the same column called Account, so I don't know how to create Measurent in a row. 

[lbendlin]

Please provide sample data that covers your issue or question completely, in a usable format (not as a screenshot).
https://community.powerbi.com/t5/Community-Blog/How-to-provide-sample-data-in-the-Power-BI-Forum/ba-...
Please show the expected outcome based on the sample data you provided.

https://community.powerbi.com/t5/Desktop/How-to-Get-Your-Question-Answered-Quickly/m-p/1447523