• A computer software firm has experienced the following demand for its Personal Finance software package:

Period	Units
1	56
2	61
3	55
4	70
5	66
6	65
7	72
8	75

Develop an exponential smoothing forecast, using a = .40, and an adjusted exponential smoothing forecast, using a = .40 and b = .20. Compare the accuracy of the two forecasts, using MAD and cumulative error.