A manager wants to use a certain forecasting technique to forecast demand for word processing units for the past five periods. Actual amounts are shown below. He had difficulties in identifying whether the used the Naive technique or the three month moving average (3-MA), what is the MAD for the Naive forecast? (Note: write the answer as a number with 2 decimal places only, e.g. 12.50, 55.83, 12.00 ) * Period Demand 120 Jan. Feb. 90 Mar. 100 Apr. 75 May 110 Jun. 50 Your