I need a step by step on how to compute the average costs. My calculations are wrong.

Mather sells a snowboard, EZslide,that is popularwith snowboard enthusiasts. Below is information relating to Mather's purchases of EZslide snowboards during September. During the same month, 102 EZslide snowboards were sold. Units Unit Cost Total Cost $ 100 103 104 105 $1,200 4.635 Sept. 1 Sept. 12 Sept. 19 Sept. 26 12 45 50 20 127 2,100 Totals 13,135 Additional data regarding the company's sales of EZslide snowboards are provided below. Assume that Mather uses a perpetual inventory system. Date Sept. 5 Sept. 16 Sept. 29 48 46 102 You r answer is partially correct. Calculate the average unit cost. (Round answers to 3 decimal places, eg. 5.125.)