Blue SA's record of transactions concerning part X for the month of April was as follows. Purchases Sales April 1 (balance on hand) 410 @ R$ 7.20 April 5 610 4 710 @ 7.30 12 510 11 610 @ 7.60 27 1,420 18 510 @ 7.70 28 150 26 910 @ 8.10 30 510 @ 8.40 (a 1) Calculate average-cost per unit. Assume that perpetual inventory records are kept in units only. (Round answer to 4 decimal places, e.g. 2.7682.) Average-cost per unit R$