You have decided to make a long call bull spread on ABC stock. You buy 1 call option on ABC stock with an exercise price of $145.00. You pay $21.09 for the call option. You sell 1 call option on ABC stock with an exercise price of $155.00. You were paid $14.00 for this call option. What is the maximum profit per share that you can earn at expiry? Your answer should be accurate to two decimal places.