Please explain solution.

An investor has the following investment opprotunity: For investment A probability return 1/3 20$ 1/3 405 1/3 605 The investor uses the utility funnction U(x) = 20 (1 -e-x/20). In particular: U(I) 20 -34.3656 40 17.2933 60 19.0043 Which of the following is the value of the risk premium p the closest to? (a) p = 23.6338 (b) p = 29.6995 (c) p = 26.0121 + correct (d) p = 27.3213