info needed, crossed photo twice to auto's

So I pollinated an auto fem with a photo then the new seeds to a different auto strain, what percent of seeds will autoflower?
2nd question: if I use a 3rd auto strain, what percent will autoflower?

the seeds from the 2nd should be around 20% auto
if you where to take 2 auto's from this batch and cross they should be fairly close to auto