For the given data and using a simple exponential smoothing method, when the forecast for year 3 is 58 and alpha is 0.3, calculate the MAPE (Mean Absolute Percentage Error). The year demand data is as follows:
Year 1: 74
Year 2: 90
Year 3: 59
Year 4: 91
Year 5: 140
Year 6: 98
Year 7: 110
Year 8: 123
Year 9: 99
Options:
1) 10.45%
2) 12.34%
3) 15.67%
4) 18.92%
