EOC Derivatives Reading 53 Q2 (Options)

CFA Level II Portfolio Management
#1

You sold 100 call options @ 17.50 and bought 80 shares of the stock at 100

Net CF -6250

At expiration, if stock price is 110,

80*110 - 100*20.

Net CF +6800

Why is it 100*20? The difference between the stock price and strike is 10.

Thanks!

#2

Strike is 90, not 100

#3

Figured it was something dumb on my part. Thanks!