I only need help with requirement 4 of this problem. Highlighted in red box.

The following information is available for Brownstone Products Company for the month of July : Units Sales revenue Variable manufacturing costs Fixed manufacturing costs Variable selling and administrative expenses Fixed selling and administrative expenses Actual 3,900 $ 55,500 20,800 14,000 9,500 10,900 Master Budget 4,000 $ 60,000 16,000 13,700 8,000 10,400 Required: 1. What was the master budget variance for July? Was this variance favorable or unfavorable? 2. Compute the July sales volume variance and the flexible-budget variance for the month, both in terms of contribution margin and in terms of operating income 4. Prepare pro-forma budgets for activities within its relevant range of operations. Prepare a flexible budget for each of the following two output levels: a. 3,930 units. b. 4,330 units Complete this question by entering your answers in the tabs below. Required 1 Required 2 Required 4 what was the master budget variance for July? Was this variance favorable or unfavorable? (Indicate the effect of each variance by selecting "F" for Favorable, "U" for Unfavorable, and "None" for no effect (i.e., zero variance).) Master budget variance 2 > Required 1 Required 2 Required 4 Compute the July sales volume variance and the flexible-budget variance for the month, both in terms of contribution margin and in terms of operating income. (Indicate the effect of each variance by selecting "F" for Favorable, "U" for Unfavorable, and "None" for no effect (i.e., zero variance).) Flexible-Budget Variance Sales Volume Variance Contribution margin Operating income Required 1 Required 2 Required 4 Prepare pro-forma budgets for activities within its relevant range of operations. Prepare a flexible budget for each of the following two output levels: a. 3,930 units b. 4,330 units. Show less Flexible budget Flexible budget Master Budget (b.) Units 4.000 Sales $ 60.000 Variable costs: Manufacturing 16.000 Selling and administrative 8,000 Total variable costs $ 24 000 Contribution margin $ 36.000 Fixed costs Manufacturing 13.700 Selling and administrative 10,400 Total fixed costs $ 5 24 100 Operating income $ 11.900