The tax administration of Bosnia and Herzegovina's Serb Republic said it has collected 4 billion marka ($2.3 billion/2 billion euro) in tax revenue in the January-October period, up 10% from the same period last year. Social security contributions, the largest category, totalled 2.5 million marka in January-October, up by 220.2 million marka compared with the like period a year earlier, the entity's tax administration said in a report on Wednesday. [...]