The line graph provides information about the monthly costs of mobile phone contracts for Domo, Sin TX, and Alpha in a particular European state from January to September 2002, expressed in euros.
Overall, prices for Domo and Lex increased steadily, and Alpha’s prices increased significantly. However, the prices of Sim Tx remained relatively the same.
Starting from 15 and 10 euros, Domo and Lex contractors increased prices for their phones up to approximately 24 and nearly 19 euros respectively, with Domo reaching its peak at exactly 25 euros per month in July. Alpha’s figures stayed relatively stable at around 5 euros throughout the period from January to June, before surging by 20 euros, making it the most notable rise among all four contractors.
In contrast, Sin Tx customers had to pay nearly 9 euros for their phones in January, with a gradual increase to just under 15 euros in June. After that, the prices of Sin Tx phones decreased to their initial value by the end of the period.