Hi, I have a question regarding the article, Playing Preflop (4): Unconventional Plays, to be more precise in the Stop and go section of the article.
I don't understand how Hero's fold equity of 40% was derived and Hero's equity vs. opponents calling range is 36%.
The paragraph reads,
'However, if you call preflop and go all-in on every flop, your opponent is getting the same odds, but having missed the flop – which will happen relatively often – he should fold often, thus increasing the EV of your play. To keep it simple, let's assume he calls on the flop with a pair or better (excluding a pair on the board) or with any draw (gutshot, OESD, or a flush draw). This means that 40% of the time he folds, and you win 4,250 in chips. When he actually does call, you have 36% equity on average and so you win 5,760 for a 6,375 investment. Therefore, your net loss is 615. Thus the overall cEV of the stop and go becomes +1,331 chips.'
Can fold equity and opponents calling range derivations be shown.

Thank you