Time for action – reviewing examinations by using the Calculator step

Can you recollect the exercise about examinations you did in the previous chapter? You created an incremental file with examination results. The final file looked like the following:

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Annual Language Examinations
Testing writing, reading, speaking and listening skills
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student_code;name;writing;reading;speaking;listening;file_processed;process_date
80711-85;William Miller; 81;83;80;90;C:\pdi_files\input\first_turn.txt;28-05-2009
20362-34;Jennifer Martin; 87;76;70;80;C:\pdi_files\input\first_turn.txt;28-05-2009
75283-17;Margaret Wilson; 99;94;90;80;C:\pdi_files\input\first_turn.txt;28-05-2009
83714-28;Helen Thomas; 89;97;80;80;C:\pdi_files\input\first_turn.txt;28-05-2009
61666-55;Maria Thomas; 88;77;70;80;C:\pdi_files\input\first_turn.txt;28-05-2009
...

Now you want to convert all grades in the scale 0-100 to...