The following table shows actual sales and forecasts for the past 4 periods. Calculate the mean absolute percentage error and the tracking signal. Round your answers  to two decimal places. Show your calculations Period Dt Ft et |et| |et|Dt 1 280 326 46 46 0.16 2 220 356 136 136 0.62 3 210 292 82 82 0.39 4 361 341 -20 20 0.06

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