At 38,000 square feet in size, they produced average weekly sales of $564,000 translating to sales per square foot of $777, and generated a contribution margin of approximately 6%. These outstanding results, combined with lower average capital investment and pre-opening expenses per store, are driving solid returns.
Drilling rigs commonly operate 24 hours per day, 7 days per week with either three crews working 8 hour shifts or two crews working 12 hour shifts. Most often day crews and night crews will alternate weekly so each crew has a chance to work during both the day and night.
Oil tankers usually sail between 14 to 17 knots, average about 14 to 15 knots. This answer is dependin â¦ g on if the vessel is loaded or in ballast. And also depending on the weather. Additional information: vessels often sail the same distance in 24 hours as an airplane fly in 1 hour.