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.
Markup and Margin. When you add a markup percentage to set the price for a product, you create a gross margin, which is the difference between the cost of the good and the price. Gross margin is typically stated as gross margin percentage. Calculate the gross margin percentage by dividing the gross margin by the price.dd the resulting dollar amount to the cost of the good to determine the price. Suppose the cost of a product is $20, and you want to add an 80 percent markup. Multiply $20 by the markup percentage, and you get a dollar markup of $16. Add $16 and $20 for a price of $36.