predetermined overhead rate is 515,00 per direct labour hous Pispare Cr for Credit What was the cost per backpack for job number Txa21? Comfy Backpacks started and finished job number TK421, a batch of 100 backpacks durning July. The job required \$4 250 of direct materai and 25 hours of direct labour at \$30per hour. The Pei predetermined overhead rate is $15.00 per direct labour hour. Prepare journal Entries to record the in currence of production cost and the completion of job number TK421,4 sing DR debit and credit. What was the cost per back pack for job number TK421