The premium on a six month call option on the market index with an exercise price of 680 is $23.00 when orginally purchased. At expiration the index spot price is 700. The call's payoff is ________ per contract. If at expiration the index spot price is 700. The call's payoff is _________ per contract. If at expiration the index spot price is 655, the call's payoff is ______ per contract.