How much perlite and vermiculite to the soil mix?

Hi,

I got my hands on some perlite and vermiculite, how much you think I should add these to the soil?


Thanks

I like 70% potting soil
20% perlite
10% vermiculite (actually, I put this in a 1 inch layer,close to the bottom)

i do 60 - 20 - 20 mix and have no complaints.

What kind of soils is being used?