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use strict;
use warnings;
...
        return " $ref";
    }
}

 1 =>  A 1.1 B 10.1 C 100.1
 2 =>  A 2.1 B 20.1 C 200.1
...
 7 =>  A 7.1 B 70.1 C 700.1
 8 =>  A 8.1 B 80.1 C 800.1
 9 =>  A 9.1 B 90.1 C 900.1