I was going thru this AICPA Release question on BEC and I was wondering why choice B is the best answer.

Roger Co. implemented activity-based costing in the current year. To select the appropriate driver for Cost Pool A, Roger performed regression analyses for two independent variables, Driver 1 and Driver 2, using monthly operating data. The monthly levels of Cost Pool A were the dependent variables in both regressions. Output results from the regression analyses were as follows:

Driver 1 Driver 2

R squared 0.46 0.80

Intercept $551.00 $970.00

X variable (slope) $ 0.55 $ 0.33

At the budgeted production level for next month, the levels of Driver 1 and Driver 2 are expected to be 5,880 and 7,000, respectively. Based on this information, what is the budgeted amount for Cost Pool A for next month?

A. $2,624 B. $3,280 C. $3,464 D. $3,785

My suggested solution is this:

Cost pool A for Driver 1 = $551 +$0.55(5800) = $3,785

Cost pool A for Driver 2 = $970 + $0.33(7000) =$3,280

Budgeted amount for Cost pool A is $3,785 + $3,280 = $7,065

Unfortunately, my answer is not among the options above. **Any help on why ‘B'is the best answer???**