The line graph illustrates the average monthly cost of contracts offered by four mobile phone companies in a European country between January and September in 2012, with figures given in euros.
Overall, Domo remained the most expensive provider during most of the period, while Sim Tx had the lowest prices. Both Lex and Alpha showed steady cost increases, with Alpha experiencing the sharpest rise by the end of the period. In contrast, Sim Tx’s prices fluctuated slightly and then declined, whereas Domo’s prices peaked in august before falling slightly in September.
Looking at the Domo first, it consistently recorded the highest prices for most of the period. Its cost rose from 15 euros in January to 25 euros in July, before falling to around 22 euros by September. Meanwhile, the figures for Lena showed a more gradual upward trend. Starting off at roughly 12 euros, if fluctuated mildly in the early months until July, but then increased steadily, reaching almost 18 euros by the end of the period.
However, both SIM TX and ALPHA followed different patterns. The former experienced some fluctuations, rising from approximately 8 euros in January to below 15 euros in June, after which it declined sharply to around 7 euros by the end of the span. In terms of ALPHA, its price showed wild fluctuations, beginning at 5 euros and remaining relatively in low price until June. After that, there was a dramatic increase, rising to 25 euros from 5 by the beginning of the autumn.