A retail store realizes a gross profit of $51.24 if it sells an article at a margin of 31% of the selling price. (Hint: Gross profit, markup, and margin all mean the same thing.) What is the regular selling price? What is the cost? What is the rate of markup based on cost? (A percentage correct to exactly 2 decimal places.) If overhead (expenses) are 21% of cost, what is the break-even price? If the article is sold at a markdown of 11%, what is the operating profit or loss?