Hi.

Please I’m getting this unusual rounding error when summing numbers using the `Decimal`

Library

My result is off by `0.01`

```
208,505,442,949.08 # Excel
208,505,442,949.09 # sum function with Decimal
```

Any suggestions please?

Thanks.

```
def sum() do
f = "C:/Downloads/MMR100.txt"
{:ok, b} = :file.read_file(f)
a = String.split(b,"\n")
c = Enum.count(a)
IO.puts c # 299,725
_sum(a, "0.00") |> Decimal.to_string(:normal)
# 208,505,442,949.08 - Excel
# 208,505,442,949.09 - sum
end
defp _sum([], acc), do: acc
defp _sum(["" | rest], acc), do: _sum(rest, Decimal.add("0", acc))
defp _sum([v | rest], acc), do: _sum(rest, Decimal.add("#{v}", acc))
```