REI sells snowboards. Assume the following information relates to REI's purchases of snowboards during September. During the same month, 106 snowboards were sold. Additional data regarding the company's sales of snowboards are provided below. Assume that REl uses a perpetual inventory system. Calculate the weighted-average unit cost. (Round answers to 3 decimal places, e.g. 5.125.) September 1$ September 5$ September 12$ September 16$ $