The data for the number of action figures sold for the past 6 weeks are 25 units, 20 units, 25 units, 25 units, 20 units, and 18 units respectively. If 50% weightage is given to week 6, 30% weightage to week 5, and 20% weightage to week 4, what is the three-period weighted moving average forecast for week 7? Group of answer choices 20 units 21 units 18 units 25 units