Alpine Production uses a standard cost system for recording transactions. Alpine reported the following data for the year ended Dec 31: Sales revenues: $550,000 Cost of goods sold (standard costing): $382,500 Selling & administrative expenses: $90,000 Variances: Sales revenue variance $4,300 F Direct materials cost variance 40 U Direct materials efficiency variance 300 F Direct labor cost variance 75 U Direct labor efficiency variance 10 F Variable overhead cost variance 275 U Variable overhead efficiency variance 80 F Fixed overhead cost variance 410 U Fixed overhead volume variance 130 F What is the net operating income on a standard cost income statement? * please show explanation with calculation Answer choices A.$171,520 B. $81,520 C. $77,500 D. $77,220