Complete the schedule of the company's total costs and costs per unit as given in the relevant tab below. 2. Harris Company manufactures and sells a single product.Learn the definition of variable cost, the variable cost formula, and how to use the formula to calculate the variable cost. Calculation of the value of the company's inventory at the lower of cost or market. Current FIFO inventory ×Net realizable value. Where,. These retail math formulas will help you evaluate your sales and inventory utilization, so you stay on top of your merchandise planning. Learn the selling price formula and techniques on how to find the perfect selling price. Maximize profits with the perfect pricing strategy! COGS is deducted from revenues (sales) in order to calculate gross profit and gross margin. Higher COGS results in lower margins.