In customer cost hierarchy, costs of all activities

In customer cost hierarchy, costs of all activities incurred to sell group of units to end consumers are classified ascustomer sustaining costscustomer output unit-level costscustomer batch-level costscorporate sustaining costsIf actual result is $5500 and corresponding amount of flexible budget on basis of actual level of output is $3500 then flexible budget variance is$2,500$5,500$3,500$2,000If flexible budget amount is $7500 and sales volume variance is $6500 then static budget amount is$7,500$6,500$1,000$10,000