The line graph illustrates the prices of copper, nickel and zinc aproximate monthly cost change.
begaining month of the year copper, nickel and zinc price changed 2,6,1 respectively. copper and nickel witnessd a dicline in starting while zinc followed an incresed of cost percentage compare then the last month.
In starting, nickel followed a dramatic decrese and copper decresed gradually, in the mean time zinc incresed 1% to 3% and meat nickel at the month of March. from the third month three meterails gradually fall until there was a sharp decline for nickel and copper.
From june the percentage of three meterail price showed an increase and remain stable till the septamber. In october to december Copper incresed 1% to 2%, Nickel and Zinc witneesed -2, -1 to 1,2 percentage respectively
