aapl trades @ 570, $20 above his strike of 550.
how does appl option trades? let's look at today's data:
aapl closed @ 600, 580put is $20 below. so the $550 put will trade at most the same price of $580 put at close, which is $8.
considering ER is over, IV will drop dramatically tomorrow, the 550put will trade around $5 at best.