In its first month of operations, Kingbird, Inc, made three purchases of merchandise in the following sequence: (1) 155 units at $5. (2) 520 units at $6, and (3) 140 units at $7. (a1) Calculate the weightect-average unit cost. (Round answer to 3 decimal places, es. 15.225.) Weighted-average unit cost eTextbook and Media Attempts: 0 of 5 used (a) The parts of this question must be completed in order. This part will be available when you complete the part above