Answer:
The activity rate for Machine setup, Special Processing, and General Factory  is $120 per machine setup, $45 per machine hours, $12 per direct labor hours respectively.
Explanation:
Computation of  the activity rate for each activity cost pool is shown below:
1. For Machine setup = Total Machine setup ÷ Number of Setup
                 = $21600 ÷ 180
                 = $120 per machine setup
2. For Special Processing = Special Processing ÷ Machine Hours
                      = $180,000 ÷ 4,000
                      = $45 per machine hours
3. For General Factory = General factory ÷ Direct labors hours
                   = $288,000 ÷ $24,000
                   = $12 per direct labor hours
Hence, the activity rate for Machine setup, Special Processing, and General Factory  is $120 per machine setup, $45 per machine hours, $12 per direct labor hours respectively.