The line graph illustrates changes in the monthly price of contracts for four different mobile phone in a particular European nation over a 9-month period starting in January in the year 2002.
In general, it is noticeable that only upwards trends were observed in all the given categories throughout the period, with the exception of ‘Alpha’. ‘Sim TX’ showed the fastest rise during the period shown, and eventually become dominant. While ‘Alpha took the last position over the period.
In the initial month, ‘Demo’ was dominant, with 15 euro monthly of contract. In the following months, there was a dramatic rise, reaching a peak of 25 euro in July, before a steady reduction to approximately 23 euro in the last month. While ‘Alpha Sim TX’ accounted for 5 euro the lowest monthly cost of contract in the first month. After which it rapidly rose to 25 euro in the final month, and it took the largest monthly price among the four contracts.
In January, the costs of ‘Lex’ and ‘Alpha’ were around 9 and 12 euros, respectively. The letter experienced a significant increase to about 18 euro in September, while the former witnessed a gradual growth to nearly 15 euro in June, before a tremendous fall to approximately 8 euro in the month September. Moreover, this figure took the last place.