How much the US-Mexico Wall will cost?

To build the wall Donald Trump will need concrete, cement, labour and other materials. The total ammount of the construction of the wall will be?

The US-Mexico border is about 1,989 miles (3200 km) long

"The wall is not built" if no decision can be reached by the deadline of this bet.

Options:
1) 0 (The wall is not built)
2) 1-10 billion dollars
3) 11-20 billion dollars
4) more than 20 billion dollars
Sources: Official US Government budget/proyects/reports.

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