Maintain 6 or 7 degrees nose-up pitch attitude to climb at 250 kts until reaching 10,000 feet (3,048 meters), and then maintain 280 KIAS to your cruising altitude. Cruise altitude is normally determined by winds, weather, and other factors.
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The standard aircraft departure climb gradient (CG) is 200 feet per nautical mile. This value is designed to provide 48 feet of clearance at one nautical mile from the departure end of the runway (DER).
It doesn't matter exactly what it means, 20% is steeper than 10%. In surveying 20% is interpreted as 20% of a right angle (i.e. a brick wall) and so would be 18 degrees.