With level strategy, how many workers would be needed during a planning horizon of four periods if the production requirements in periods 1, 2, 3, and 4 are 1,000, 800, 1,200 and 1,100 units, respectively? Assume that one worker can produce five units in one day and that there are 22 workdays in period 1, 17 workdays in period 2, 21 workdays in period 3, and 22 workdays in period 4. Also, assume that the beginning and ending inventories required are both 100 units in each period.