Answer:
The expected value of the total sales projection is $24,773.
Explanation:
Let sales be A,B and C respectively for each outcome. 
Total Sales = A + B + C 
E(Total Sales) = E(A + B + C) 
We know that A, B and C are three mutually exclusive events as they all cannot be true at a given point time 
 
E(Total Sales) = E(A) + E(B) + E(C) 
= 0.3*285*32 + 0.4*490*47 + 0.3*750*57 
= $24,773 
Therefore, expected value of the total sales projection is $24,773.