Probability Demand S$1$ S$2$ S$3$ Low $0\mathrm{.}1020-10-140$ Medium $0\mathrm{.}50607030$ High $0\mathrm{.}4060110210$

A$)$ Determine the EMV?

B$)$ Draw a Decision tree?

Choose the best alternative out the three, among

S$1$: Sub Contract

S$2$: Overtime

S$3$: New Setup

Through both methods

Note:$-$It is mandatory to draw a decision tree.