1 Onset of sleep from time the lights were turned off; this is called  sleep onset latency  and normally is less than 20 minutes. ( 2 Note that determining sleep and awake is based solely on the EEG. Patients sometimes feel they were awake when the EEG shows they were sleeping.
The direct cost margin is calculated by taking the difference between the revenue generated by the sale of goods or services and the sum of all direct costs associated with the production of those goods, divided by the total revenue.
Instructions. Determine your margin percentage and add one to the margin. For example, assume your margin is 20 percent, so one plus 0.2 equals 1.2. Find your total costs. In the example, assume your total costs are $500. Multiply your total costs by one plus the margin.In the example, $500 times 1.2 equals $600.he amount above the cost is known as the margin. This is the profit you make on selling each item. This is a very important calculation for your business if the business is to become profitable.