How much more is '翻一番‘ I think this means 'double the sales volume', but 翻 can mean 'turnover' as in 'sales volume' or 'double'. '一番‘ seems to mean 'twofold'. I'm a bit confused. 

。。。在未来十年内实现销售额翻一番， 。。。maybe = ...double the turnover in the next ten years ...

Which word is 'double'??
Here 翻 means multiply, 番 means time;fold.

And
翻番/翻一番 -> *2(double)
翻两番 -> *4
翻三番 -> *8
... ...