Which of the following statements concerning percent of sales forecasting is most correct.$-$ As long as the frm is currently operating at full capacity, fixed assets should be set as a constant percent of sales, even if they may be somewhat lumpy in reality.$-$ Determining additional funds needed $($AFN$)$ may require an iterative solution, since financing charges may lead to circular relationships: income statement determines additions to the balance sheet, whichdetermines funding needs, which determine financing charges, which determines the income statement, and so on$.-$ Although the firm may exhibit economies of scale, the percentages that we observe for individual assets $($such as cash, inventory, fixed assets, etc.$)$ will not vary over time as the sales of the firm change.$-$ A disadvantage of the spreadsheet model is that it is not easy to include changes in a firm's profit margin, changes in its dividend policy. planned acquisitions of assets, or repayments of liabilities.$-$ Simply due to its mathematical basis, the equation model for percent of sales forecasting will producea more accurate forecast than a spreadsheet model.