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5) Holt's method is used in obtaining forecasts for a product. The following table summarizes some of the information: Period t 1 2 D 500 350 250 St 500 455 390.4 385.9 Gt 0 -4.5 -10.5 -9.9 Ft-1,0 500 500 450.5 et 0 -150 -200.5 3 4 5 6 7 450 350 200 378.3 318.6 -8.9 -14 376 390.5 369.4 74 -40.5 -169.4 MAD, as measured considering the seven periods, is 93.5. Using only one digit after the decimal point in your calculations should be sufficient. a) Use the above information to find smoothing constant values a and B. b) Fill in the missing values in the table (i.e., D4, F3,4, 24, Ss and Gs). c) Assuming that Ds = 300, and using the same smoothing constants utilized in obtaining the above information, find a forecast for sum of demands in Period 9 and Period 10