A friend of mine sent me this formula sheet for AS and A Level business, so I decided to help yall out too. You can find it here.This guide covers various safety stock formulas, including the AverageMax and statistical methods, to help you determine optimal safety levels. Safety stock simply is inventory that is carried to prevent stockouts. Safety stock is surplus inventory that is kept in storage in case of a sudden surge in demand or supply chain issues to reduce the risk of stockouts. Net cash flow = total cash inflows total cash outflows. Learn how to use this formula and others to improve your understanding of your cash flow. Cash flow is the movement of money in and out of a company. The consumption function is a mathematical formula that represents the functional relationship between total consumption and gross national income. The 1099 tax forms report your winnings to the taxing authorities and also gives you information for completing your taxes.