Prepare a full decision table for the following case and then simplify.

An airline offers only flights to Russia and Asia. Under special conditions, a discount is offered on the normal airfare:

• Children 2 and under travel for free.
• Passengers older than 2 but younger than 18 years are offered a discount of 40% for all destinations.
• Passengers older than or equal to 18 with destinations in Russia are offered a discount of 20%.
• Passengers who stay at least 6 days at their destination receive an additional discount of 10% except children 2 and under.