Calculate the Risk

What is the expected loss if there us a 1% chance of a black hat bringing down the order entry system requiring a server restore? The mean time to restore is 6hrs. Orders come in an average of 12hrs a day bringing in 500000 a day in revenue across a 364- days a year. The attacks are expected daily   The Asset Value = 500000 Exposure Factor= 6hr12hr = .5 LE- 500000 x .5 = 250000 ARO = .01 x 364 = 3.64 ALE = SLE x ARO = 250000 x 3.64 = 910000