Answer: Hello  attached below is the missing part of your question
answer : Â discount will be the preferred service, if the probability of strong demand is less than 0.5786
Explanation:
The full price ( EV ) = (960)*p + ( -490 )*(1-p)
                = 960p + 490p - 490
                = 1450p - 490  ------------- ( 1 )
Discount price ( EV ) = Â (370)*p + (320)*(1-p)
                 = 370p - 320p + 320
                 = 50 p + 320 ---------------- ( 2 )
equate equation 1 and 2
1450p - 490 = 50p + 320
1450p - 50p = 320 + 490
∴ p = 810/1400 = 0.5786
Hence discount will be the preferred service, if the probability of strong demand is less than 0.5786