Format output and columms

In Linux in Bash in a for loop i do: ... ; do echo "$i --> $i-new" ; ... The output is than something like this: file1 --> file1-new file2 --> file2-new ... file9 --> file9-new file10 --> file10-new file11 --> file11-new how to become an output like this: file1 --> file1-new file2 --> file2-new ... file9 --> file9-new file10 --> file10-new file11 --> file11-new ?