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Question 10 1 pts An unfavourable labour efficiency variance resulting from the use of poor quality materials should be considered the responsibilty of which/whom? The engineering department. The purchasing agent. The production manager. Manufacturing overhead. Question 11 1 pts When preparing budgets, one important behavioural issue that must be managed is: The tendancy of participants to try to build slack into the budget for their area of responsibility The difficulty of predicting employees' hourly rates. The problem of getting so many calculations correct. The high level of enthusiasm and excitement of the managers who are participating in the process