Manufacturing Corp. expects to sell the following number of prefabricated buildings. The probability of each state is indicated. What is the expected value of the total sales projected? Outcome Probability Units Price Bad 0.20 100 $20 Normal 0.50 180 $25 Great 0.30 210 $30 My choices are: (a) $4,500, (b) $4,540, (c) $12,800, (d) none of these