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I'm using QGIS, and I have two vector layers (with polygons),

I'd like to get the % of area of polygon in layer b respect to polygon in layer A, and for that I want to calculate the area of a layer A and the area of a layer B, and then using the vector calculator do (Area B/Area A)*100

1st part (calculate areas) is OK but... Can I use the field calculator using two different layers (to divide area polygon layer b and area polygon layer A)? I tried but I'm not getting it.

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