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

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

January

and September 2002, measured in

euros

.

Overall

, it can be seen that the average

cost

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

in contrast

, declined. In

January

, the fee for demo devices at 15

euros

per month

then

suddenly went up by 20

euros

and maintained

this

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

euros

but

then

mildly decreased at over 23

euros

, ranked second throughout the

period

in spite of ranking first at the first of the

period

.

Conversely

, the average

cost

of sim TX was lowest during the

6months

Correct your spelling

6 months

from

January

by approximately 5

euros

, but from June it rapidly increased to 25

euros

ranked first

at the end

of the

period

. From

January

to May, the

cost

of Lex and Alpha devices had the same pattern

then

they saw an approximately same at about 12

euros

. The

cost

of Lex

then

gradually increased to 19

euros

,

by contrast

, the figure for Alpha massively went down by over 8

euros

, ranked lowest throughout the

period

.