Key inventory management formulas - Safety stock Safety stock is the backup stock needed to meet unexpected supply problems and/or sudden changes in demand. Calculate the Safety stock Formula: (Max daily sales volume x Max lead time) - (Avg daily sales volume x Avg lead time) Max daily sales volume = 1200 units per day Max lead time = 7 days Avg daily sales volume 1100 units per day Avg lead time = 5 days Group of answer choices 190 units 1900 units 2900 units 290 units