If the amount of fish caught by Adam and Betty are given by YA = ha (20 - (h4+ hp)) and yp = họ (20 – (hp + hy) ), respectively, then (i) Derive Adam and Betty's utility function each in terms of h, and he (ii) Sketch their indifference curves on the axes below with Adam's fishing hours (ha) on the horizontal axis and Betty's fishing hours (hp) on the vertical axis. (iii) Briefly explain the direction in which utility is increasing for Adam, and for Betty respectively [5 points]