Question 666525
To find their expected outcome, take each possible outcome, multiply it by the probability of that outcome, then sum all the resulting values. 
 
We are given
p(+$20,000) = 80% = 0.80
p($0) = 15% = 0.15
p(-$5,000) = 5% = 0.05
 
Multiplying each outcome by its probability:
$20.000 * 0.80 = $16,000
$0 * 0.15 = $0
-$5,000 * 0.05 = -$250
 
Summing these gives $15,750.
 
PuroServ should expect a profit of $15,750 on the purchase.