Question 13 2 pts Which of the following is TRUE about standard costs? Standard costs can be used as benchmarks for measuring performance. Standard costs are usually the responsibility of one person in a company, Standard costs are not based on predetermined amounts. All of these are true D Question 14 2 pts Which of the following is TRUE about labor efficiency (quantity) variances? All of these are true The production manager generally must explain why the actual hours were different from standard. The wage rate paid to employees differs from standard rate. It is calculated using the formula: (AHAR) -(AHX SR)