A January 2022 (expiration date) put option on Apple stock with an exercise price (X) of 800 was selling on December 2, 2021, for 100 (premium :P) The option expires on January 15, 2022 Current stock price of Apple So=1000 Payoff at T for put holder Payoff at T for put writer If St =1000 If St =500 Net profit for put holder Net profit for put writer If St =1000 If St =500 When St=1000 at time T, the payoff at T for the put option holder is 1.1 (Required) When St=1000 at time T, the payoff at T for the put option writer is 1.2 (Required) When St=1000 at time T, the net profits at T for the put option holder is 1.3 (Required) When St=1000 at time T, the net profits at T for the put option writer is 1.4 (Required) When St=500 at time T, the payoff at T for the put option holder is 1.5 (Required) When St=500 at time T, the payoff at T for the put option writer is 1.6 (Required) When St=500 at time T, the net profits at T for the put option holder is 1.7 (Required) When St=500 at time T, the net profits at T for the put option writer is 1.8 (Required)