I was curious as to how a person calculates the expected payoff
dealing with states of nature. An example:

                              States of nature

                  High Sales       Med.Sales        Low Sales
                    A(0.2)           B(0.5)            C(0.3)

A1(sell Juice)      3000              2000             -6000
A2(don't sell)        0                 0                 0  

What would be the expected payoff for A1 and A2?  What would be a good
recommendation concerning the payoffs? How would I interpret the
results based on practical considerations?

The expected payoff for A1 is 0.2*3000+0.5*2000+0.3*(-6000)=(-200)
The expected payoff for A2 is 0.2*0+0.5*0+0.3*0=0

Recommendation: Don't sell for the market risk is too high.