Ann's payoff is 13
the subgame perfect equilibrium for the game is for Ann to offer (14,1) and for Bob to choose grab and run, giving Ann 13 and Bob 2
By backward induction we can see that,
If ann offers (8,7), Bob will accept the offer giving Ann 7. She can do better.
If ann offers, (1,14) Bob will accept the offer giving Ann 1. She can do better.
Thus, Ann offers (14,1) and Bob's best strategy is to Garb and run to maximize his profits. This gives a payoff of 13 for Ann and she can not do any better than this.
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