The line graph illustrates the average monthly contract costs for four distinct mobile phones in a European nation between January and September 2002.
Overall, the monthly contract costs of all mobile phones experienced a decrease, whether it was small or not. It can be seen that Domo’s contract dominated till the end of the period, while Alpha overtook the other three phones’ contacts, step by step, during the final four months.
Lex and Sim TX remained relatively stable throughout the period. Starting at around €13, the figure for Lex showed little fluctuation by June, while in the next three months, the figure gradually increased to €18, making it the third most expensive contract. The figure for Sim TX was a bit below €10 and slightly increased to €14 in which overtook the contract cost of Lex. Although the contract costs of Sim TX gradually increasing from €9 to about €15, the mobile phone’s figure unexpectedly failed to reach €7, which was placed at the bottom of the list at the end of the period.
Other types of phones—Domo and Alpha—showed unexpected changes. In January, Domo was making a contract for about €15, and this upward trend was continuously increasing to €25, which reached its peak in July. But this number decreased significantly by September, with an accelerated fall post-July, finishing the period with €22. The figure for Alpha, starting the period at a minor €5 notably, the figure fluctuated around €5. By the end of the period, Alpha had gained huge contract costs, with more than €25, thus becoming by far the most profitable type of product. Interestingly, the figure overtook the other three phone contract costs in three months: July, August, and September.
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