Ray's Satellite Emporium wishes to determine the best order size its best-selling plate, model TS111. Ray has estimated the annual demand for this model at 1,000 units. His cost to carry one unit is RM1.25 per unit per year and he has estimated that each order cost RM5 to place. Ray's Satellite Emporium operates business 365 days per year and finds that deliveries from his dealer generally take 5 working days.