the chart below show the average cost of month contract for four different mobiles in a European country from January to September 2002, measured in euros per month.

The given chart illustrates the total

cost

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of the monthly contract for 4 varied cellphones in certain European countries namely Domo, Lex, sim TX and Alpha between

January

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and September 2002, measured in

euros

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.

Overall

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, it can be seen that the average

cost

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of Demo, Lex and Alpha devices saw upward trends whilst the figure for sim TX ,

in contrast

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, declined. In

January

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, the fee for demo devices at 15

euros

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per month

then

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suddenly went up by 20

euros

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and maintained

this

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position from one month to June. Surprisingly, it still dramatically increased to 25

euros

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but

then

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mildly decreased at over 23

euros

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, ranked second throughout the

period

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in spite of ranking first at the first of the

period

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.

Conversely

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, the average

cost

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of sim TX was lowest during the

6months

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6 months

from

January

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by approximately 5

euros

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, but from June it rapidly increased to 25

euros

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ranked first

at the end

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of the

period

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. From

January

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to May, the

cost

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of Lex and Alpha devices had the same pattern

then

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they saw an approximately same at about 12

euros

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. The

cost

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of Lex

then

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gradually increased to 19

euros

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,

by contrast

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, the figure for Alpha massively went down by over 8

euros

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, ranked lowest throughout the

period

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.