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.
Burning legs can result from a number of causes, including damage to nerves in the legs from exposure to extreme heat or cold or to toxic substances. Burning legs might also result from a circulation problem that impairs blood flow to the legs, a leg injury, or intense exercise.
A person with leg pain has discomfort in the structures of the leg. Leg pain may be caused by an injury, irritation, or inflammation of the skin, muscles, bones, or joints in the leg. Sciatica, or a herniated disk in the lumbar spine, may cause pain that shoots down the leg.