Using trunc function in Erlang

[Erlang Questions]

Hello everybody, I have one question about Erlang trunc function.

Why Erlang behaves like this?

1> trunc(1.3/0.1).
13
2> trunc(1.4/0.1).
13
3> trunc(1.5/0.1).
15

And which you think is the best way to manage this in order to solve this kind of problems?

Thanks in advance.
Happy new year for everyone!!
Carlos.-
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