The line graph compares the average monthly contract cost of four mobile companies in a European country from January to September 2012, measured in euros.
Overall, the most expensive service throughout the period was provided by Domo, while Lex remained the cheapest. In addition, Alpha showed a significant rise by the end of the period, whereas Sim TX experienced a noticeable fall.
At the beginning of the year, Domo’s plan cost around 15 euros and increased gradually to reach a peak of about 27 euros in August before ending slightly lower in September. In contrast, Lex started at approximately 12 euros and followed a downward trend, falling steadily to just under 5 euros in the final month.
Sim TX began at about 8 euros in January and rose moderately to reach its highest point of around 15 euros in June. However, its price then declined sharply, finishing the period at roughly 5 euros, similar to Lex.
Alpha showed the most dramatic change. Starting at around 5 euros, its cost decreased to around 3 euros in May. After that, it rose rapidly, reaching around 25 euros in September, making it the second most expensive plan by the end of the period.