Company A has the following documents: - Unit production cost 1,000 VND/product (including variable production cost 800 VND/product); - Sales and corporate management expenses are 500 VND/item (in which variable sales and corporate management costs are 120 VND/item); - Production level in the period is 2,000 products; Consumption during the period is 1,500 products. Total variable costs for the period are: a. 1.160.000 d b. 1.840.000 d C. 1.780.000 d. 1.870.000