The chart below shows the average cost of a monthly contract for four different mobiles ( cellphones) in a European country from January to September 2002, measured in euro.

Contained in the line graph is data pertaining to a comparison of the mediocre cost that four distinct mobile phone companies

charge

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charged

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for monthly contracts in 2002. The units are measured in

euros

.

Overall

, three out of four the price of contracts experienced an upward trend

whereas

the opposite was true for

Sim

TX

.

Additionally

, Alpha underwent the most dramatic climb in the

last

four months. Regarding Domo and Lex, the two figures fluctuated to quite similar degrees. Domo offered the most expensive plan at around 15

euros

in the first month, followed by Lex at 12

euros

, albeit in the

last

three months, Domo enjoyed a downward tendency and

finally

ended at 23

euros

,

while

Lex was the opposite and ended at 18

euros

. Moving onto two remaining figures, which had the significant opposite in price.

Sim

TX

started at 9

euros

while

the beginning point of Alpha was at 5

euros

. Five months later, they enjoyed a fluctuation but still remained the same distance.

However

, three years later, Alpha surpassed

Sim

TX

in Jujy and soared to reach the highest point in September at 25

euros

.

While

Sim

TX

declined in price and turned into the least one.