Sometimes, the root cause of a variance requires that variance analysis be performed in both hours and

Question:

Sometimes, the root cause of a variance requires that variance analysis be performed in both hours and dollars. It is possible that calculating the variances in both hours and dollars is the only way to determine the root cause of a problem.
Problem: In Table 15€“15, the cost and schedule variances are measured in fully burdened dollars for Cost Center 2834 only.
From Table 15-15, you are ahead of schedule and over budget. There could be several possible causes for this, including schedule compression, using higher salaried labor, overtime, additional resources, or other causes. How can we determine which of these causes is the real reason for the variances?
Table 15€“16 shows the variance data in both hours and dollars.
a. Calculate the cost variances in both hours and dollars. Compare the results. What are your conclusions?
b. Calculate the planned fully burdened labor rate using BCWS (or BCWP).
c. Calculate the actual fully burdened labor rate using ACWP.
d. Explain the possible reasons for the differences in labor rates and how this affects your answer to part a.
e. Table 15€“17 shows the departmental pay structure for Cost Center 2834. Determine the departmental overhead rate, in percent.
f. How does Table 15€“17 affect your answer to partd?