Answer:
$0
Step-by-step explanation:
Norway's national debt is the sum of all its previous government surpluses and deficits. Until 2010, Norway had a $180 billion surplus, and even after having two consecutive deficits (government spends more than its total revenue), the account will still be positive: $180 billion - $35 billion (2011) - $25 billion (2012) = $120 billion.
We can analyze national debt as our personal finances; if we have saved a lot of money in the bank we can afford to buy some extra things without having to use our credit card. But if we don't have enough money in the bank, if we want to buy a new car then we will need a car loan.