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Anything you can chose between giants and archers as they are the most useful troops in clash of clans and are pretty cheap too. So you should upgrade them first.
1500000
2,750,000 elixir, but you get witches.
2,000,000 elixir (2 Million)
In clash of clans, the maximum level on balloons is level 8
At level 1 it costs 15000. It increases by 3500 every upgrade.
Level 15 walls do not exist in Clash of Clans, although they might in a future update.
180
The price goes up some per level. The first upgrade is 10,000 dark elixir. By the time you reach level 40, it will be 190,000.
It takes six days to upgrade to Town Hall level 7.
The maximum amount of walls you can have in Clash of Clans go up to Level 10
level 63 in clash of the clans