calculation

Based upon the following historical data, answer the following questions: a. Calculate the exponential smoothing forecast for periods 2 to 12 using an initial forecast (FI) of 200 and (a) of 0.50. b. Use MAD and MAPE to measure accuracy of the forecasting model. c. Which of the two forecast accuracy methods (in question b) would you prefer and why? Week Actual Week Actual Demand Demand 1 200 7 180 2 150 8 220 3 300 160 4 200 10 5 250 11 165 280 12 185 9 140