The old deseasonalized forecast is 100 units,α = 0.25 and the actual demand for the last month was 150 units. If the seasonal index for the last month is 1.2 and the next month is 0.8, calculate:
a. The deseasonalized actual demand for the last month.
b. The deseasonalized forecast for next month using exponential smoothing.
c. The forecast of actual demand for the next month.