Sandhill Company uses a perpetual inventory system and reports the following for the month of June. (a1) Calculate the weighted-average cost per unit, using a perpetual inventory system. Assume a sale of 400 units occurred on June 15 for a selling price of $8 and a sale of 45 units on June 27 for $9. (Round intermedlate calculations to 0 decimal ploces, es. 152 and final answers to 3 decimal places, eg. 5.125.) June 15 June 125 June 15$