Please help with question 3 and 4 !

Simpson Manufacturing has the following standard cost sheet for one of its products: The company uses a standard cost system and applies factory overhead cost based on direct labor hours and determines the factory overhead rate based on a practical capacity of 400 units of the product. Simpson has the following actual operating results for the year just completed: Before closing the periodic accounts, the (standard cost) entries in selected accounts follow: Required: 1. Determine for the period the following items: a. Flexible budget for variable factory overhead cost based on output for the period. b. Total variable overhead cost applied to production during the period. c. Total budgeted fixed factory overhead cost. d. Total fixed factory overhead cost applied to production during the period. 2. Compute the following factory overhead cost variances using a four-variance analysis: a. Total variable overhead cost variance. b. Variable overhead spending variance. c. Variable overhead efficiency variance. d. Total underapplied or overapplied variable overhead. e. Fixed overhead spending variance. f. Fixed overhead production volume variance. g. Total fixed overhead cost variance. h. Total underapplied or overapplied fixed overhead. 3. Compute the following factory overhead cost variances using three-variance analysis: a. Overhead spending variance. b. Overhead efficiency variance. c. Fixed overhead production volume variance. Compute the following factory overhead cost variances using three-variance analysis: Compute the total overhead flexible-budget variance and the fixed overhead production volume variance using a two-variance analysis