Return on investment (ROI) is a performance measure used to evaluate the efficiency of an investment or compare the efficiency of a number of different investments. It is calculated by dividing the income generated by the investment by the cost of the investment itself. This ratio provides a percentage that helps stakeholders understand the profitability relative to the capital deployed.

The Quick Ratio, also known as the Acid-Test Ratio, is a stringent measure of liquidity. It excludes inventory and prepaid expenses from current assets, focusing only on the most liquid assets (cash, marketable securities, and receivables) to determine if a company can meet its immediate short-term obligations.

Liquid or quick assets are those assets that can be converted into cash almost immediately without significant loss in value. These typically include cash on hand, bank balances, and marketable securities, excluding inventory which may take longer to sell.

Quick assets are current assets that can be converted into cash within a very short period, typically 90 days or less. Cash and accounts receivable are highly liquid, whereas inventories are generally excluded because they require time to be sold before they become cash.

The acid-test ratio, also known as the quick ratio, measures a company's ability to meet its short-term obligations using its most liquid assets. It excludes inventory from current assets, providing a more stringent assessment of liquidity than the standard current ratio.

Liquid or quick assets are defined as current assets that can be converted into cash quickly without significant loss in value. Since inventory (stock) and work-in-progress are not immediately liquid, they are subtracted from total current assets to determine the quick asset position of a firm.

Return on sales is a key profitability ratio that measures the percentage of revenue that remains after covering operating expenses. By dividing operating income by total revenue, management can assess how effectively the company converts sales into operating profit. This ratio is a critical indicator of operational health and is widely used by analysts to evaluate management's ability to control costs relative to revenue generation.

Return on sales (ROS) is a ratio that evaluates a company's operational efficiency by showing how much profit is being produced per dollar of sales. The formula is (Operating Income / Revenue) * 100. Using the provided figures: ($5,650,000 / $68,558,000) * 100 equals approximately 8.24%. This metric is essential for comparing the profitability of companies within the same industry.

Net profit is calculated by subtracting the cost of sales and expenses from total sales. Here, $150,000 - $90,000 - $45,000 = $15,000. To find the net profit percentage, divide the net profit by total sales and multiply by 100: ($15,000 / $150,000) * 100 = 10%. This ratio indicates the portion of each dollar of revenue that remains as profit after all costs are covered.

The debt ratio is a solvency metric that indicates the proportion of a company's assets that are financed through debt. It is calculated by dividing total liabilities by total assets. This ratio helps stakeholders understand the financial leverage of a company and its ability to meet long-term obligations by comparing its total debt burden against its total asset base.