While it is not uncommon for the precise source of chest wall pain to remain unknown, some possible causes of costochondritis include: 1  Injury or trauma: Pain within the area of the chest wall may emerge as the result of a direct blow or injury to the area. Arthritis: Some evidence has suggested that symptoms of costochondritis are associated with degenerative joint conditions, such as osteoarthritis or rheumatoid arthritis.
In retail, unit price is the price for a single unit of measure of a product sold in more or less than the single unit. The unit price tells you the cost per pound, quart, or other unit of weight or volume of a food package. It is usually posted on the shelf below the food.
Costs per unit are: Cost 1: $100,000/8,000 = $12.50 and $125,000/10,000 = $12.50. Cost 2: $40,000/8,000 = $5.00 and $50,000/10,000 = $5.00. Cost 3 is a mixed cost since the total cost is different, however, since the cost per unit is not the same at both levels, this is a mixed cost.