Усердие против лени

Alexandra and Bob can each choose how hard to work on a task. Each person's output is $\pounds 80$ if they are lazy, and $\pounds 160$ if they work hard. The cost of effort is $\pounds 0$ if they are lazy, and $\pounds 70$ if they work hard. The total output is shared equally between them. For example, if Alexandra puts in her effort but Bob does not, her net income is $\pounds 120 - \pounds 70 = \pounds 50$. If both workers are completely selfish, then in the equilibrium outcome they will each end up with a net income of: