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.
Other Direct Labor Calculations Once you've determined direct labor costs, you can use the figure to calculate other ratios and metrics. If you want to know direct labor cost per unit, divide total direct labor costs by the total amount of units of goods produced during the period.You could also evaluate direct labor costs as a percentage of revenue. To calculate this metric, divide direct labor costs by total revenue for the period.alculating Direct Labor Costs To calculate direct labor costs, sum the total eligible costs incurred during the year. Direct labor costs include the following components: 1  Wages. 2  Payroll taxes. 3  Worker's compensation. 4  Direct recruiting costs. 5  Health insurance. 6  Dental insurance.