Hi Jose,
A Bubble Chart is an extension of Scatter chart which allow us to add an additional third measurable value which forms the bubble area viewed by bubble width or height.
I have prepared a report in Rich client, City as a dimension and quantity sold, sales% and Sales revenue as Measures.
Here I have used Scale showing Sales %.
Depth(area) of bubble is displayed by sales%.
And then, we can choose the options choose the set "Set default colors" or "Clear Color Assignment"
Thanks,
Vizit