The expected monetary value of Scheme A is EMV = 0.4 * 200+0.35 * 80+0.25 * (30) =100.5.

The expected monetary value of Scheme B is EMV = 0.4 *100+0.35 * 40+0.25 * 0 = 54.

The expected monetary value of Scheme C is EMV = 0.4 * 50+0.35 * 40+0.25 * 30 = 41.5.

Estimated annual income scheme A: 100.5-250/6=58.8

Estimated annual income plan B:54-90/6=39

Estimated annual income scheme C:4 1.5-40/6=34.8.

Example:?

If all goes well in Project A, the probability of making a profit of 200,000 is 20%; Under normal circumstances, the probability of profit180,000 is 35%; In the case that all risks will occur, the probability of losing 200,000 is l5%. Then the EMV of the project = 20x20%+18X35%+(20x15%) = 3.3 (ten thousand yuan). If all goes well in Project B, the probability of making a profit of 200,000 is L5 %；;

Under normal circumstances, the probability of earning 400,000 is 50%; In the case that all risks will occur, the probability of losing 300 thousand is 20% The EMV of this project is 20x15%+40x50%+(30x20%) =17 (ten thousand yuan). Compared with two EMV values, project B is worth doing, because the EMV value of project B is higher.

Baidu Encyclopedia-Expected Currency Value