Weighted Average Cost Method Formula. We simply apply the same cost to all of them. Weighted avg = 10% * 5% + 20% * 10% + 30% * 15%.

Sum of variables (weight) /. To sum it up… we calculated 3 different balances of stock at 30 june 20x1 based on different cost formulas. Saibal ray, james mcgill professor and academic director at mcgill university’s bensadoun school of retail management in the desautels.