This represents the percentage of each dollar of a company's revenue available after accounting for cost of goods sold. If a company produces phones and earns $32 million in sales but pays $24 million for the items sold, then the company's gross profit margin would be ($32M - $24M) / $32M = 25 percent.
The causes of burning feet are numerous and varied, ranging from simple fatigue to more serious conditions such as a nerve damage or circulatory issues. Therefore, the underlying cause should be diagnosed as soon as possible to avoid long-term damage and morbidity.
Blisters are commonly caused by friction from tight shoes, herpes, chicken pox, poison ivy and allergic reactions. More uncommon are disorders that only cause blisters on the hands and feet. See your doctor for an accurate diagnosis if you have blisters on your hands and feet, particularly from an unknown cause.