Scaling Macro on selected object

I recorded a macro to scale currently selected object ( it is grouped object ) by going into 100% to 300% at the top panel.

It is fine for the first object and in the macro, it is written as below:

 ActiveSelection.SetSize 5.116122, 5.117437 ( instead of 300% )

So, this scaling uses numbers instead of 300% ( percent )

so, all objects on other pages goes scaling by numbers and turned out incorrect aspect ratios. Since objects sizes are different WxH,

some objects turn out totally incorrect ratios.

Are there  ActiveSelection.SetSize routine has % percent, can I put in 300%??

And where is documentation about these functions calls???

I am using CorelDraw 2020. Thanks