Which of the following statements is most correct? The operating margin is determined by subtracting all operating and non- operating expenses from the gross margin. From an investor's point-of-view, the price-to-earnings ratio is a good indicator of whether or not a firm is generating an acceptable return to the investor. The best way to determine the firm's liquidity is to calculate the Current ratio. The quickest way to determine whether the firm has too much debt is to calculate the Times-interest-earned ratio