Question: . Jangson Group purchase items from a vendor at a cost of $20 each, and the forecast for next years demand is 1000 units. If

. Jangson Group purchase items from a vendor at a cost of $20 each, and the forecast for next years

demand is 1000 units. If it costs $5 every time an order is placed for more units and the storage cost is $4

per unit per year. Compute the following:

Mean Error (ME):

Mean Absolute Deviation (MAD):

Mean Square Error (MSE):

Mean Absolute Percentage Error (MAPE):

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