Answer: 12.8 units
Step-by-step explanation:
Using the weighted moving average technique means using calculating a weighted average of the demands for the past 3 months using their weights and demand.
April forecast = (January sales * January weight) + (February sales * February weight) + (March sales * March weight)
= (10 * 0.2) + (11 * 0.3) + (15 * 0.5)
= 2 + 3.3 + 7.5
= 12.8 units