The line graph illustrates the amount of money that users have to allocate for four different mobiles each month from January to September 2002, in a European nation.
Overall, the cost for one month of Domo mobile was always the highest in most months in this period, except for September, after being overcomed by Sim TX.
It can be seen that, In January, the average monthly cost of Domo was dominated by 15 euro, which was followed by that of Lex with about 13 euro. From January to Jun, the former increased significantly and continuously to 25 euro, the latter experienced a downward trend to 10 euro in February, before also increasing steadily to above 15 euro in Feb. From June to September, while the cost for Domo each month slightly decreased to 23 euro, that of Lex witnessed an upward trend to 18 euro.
Furthermore, In January, the cost for Alpha was 10 euro, which was twice as much as that of Sim TX. After 5 months, the expenditure that users have to pay for Alpha a month increased to approximately 15 euro, which was trouble with that of Sim TX with only 5 euro. In September, while the figure for Sim TX surged dramatically to 25 euro, that of Alpha reduced to 9 euro.