The project performance report includes the following figures: PV = 110, EV = 100, AC = 120, and the total budget is 150. What is the cost variance? 项目绩效报告中包括如下数字:PV=110, EV=100,AC=120,总预算为150。成本偏差是多少? A.
-20 B.
-10 C.
10 D.
20