A helicopter tour company purchases insurance for lost business due to rain in the month of May. The insurance pays 500 for each day in excess of 2 days that the helicopters are grounded due to rain. The number of days, X, the helicopters are grounded is binomial with n = 31 and p = 0.05. Find the expected insurance payment under this policy.    A:100    B:123    C:145    D:257    E:346

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