The following information is available for Brownstone Products Company for the month of July: Required: 1. What was the total operating income variance for July? (Note: this variance is also called the master (static) budget variance for the period.) Was this variance favorable (F) or unfavorable (U) ? 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. 3,880 units. b. 4,280 units. Complete this question by entering your answers in the tabs below. What was the total operating income variance for July? (Note: this variance is also called the master (static) budget variance for the period.) Was this variance favorable (F) or unfavorable (U)? (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance).) 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).) 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. 3,880 units. b. 4,280 units