Please help me with question 29, 30(a+b)

Advanced Company reports the following information for the current year. All beginning inventory amounts equaled $0 this year. Units produced this year 25,000 units Units sold this year 15,000 units Direct materials $8 per unit Direct labor $10 per unit Variable overhead $3 per unit Fixed overhead $50,000 in total Variable selling and administrative $5 per urit Fixed selling and administrative $20,000 in total Selling price $50 Given Advanced Company's data, compute the contribution margin per unit using variable costing. The following materials standards have been established for a particular product: The following data pertain to operations concerning the product for the last month: The direct materials purchases variance is computed when the materials are purchased. Required: a. What is the materials price variance for the month? (Input the amount as a positive value. Leave no cells blank - be certain to enter "O" wherever required. Indicate the effect of each variance by selecting " F " for favorable, " U " for unfavorable, and "None" for no effect (i.e., zero variance.) b. What is the materials quantity variance for the month? (Input the amount a as positive value. Leave no cells blank - be certain to enter "O" wherever required. Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance,)