When forecasting income statements, which of the following is generally a key assumption firms make about their variable operating costs? Variable operating costs increase at the same rate as sales, Variable operating costs are forecast to be the average of the operating costs during the previous three years. O Variable operating costs are set at industry averages. O Variable operating costs remain the same each year. Variable operating costs decrease when sales increase. Question 40 1 pts In the control phase of the financial planning process, projected financial statements must be evaluated to determine: O whether the forecasts meet the firm's financial targets. the firm's operating breakeven at different sales levels. the amount of internal funds the firm must raise to meet its financial goals. O whether economies of scale have been achieved. the level of leverage the fim can attain with its forecasts