There is few ways to get the result. The easiest is calculating step by step (year by year) price of the computer. 50%=0.5 (in decimal) 2100*0.5=1050 - 1 year 1050*0.5=525 - 2 year The result it 2 years. To get more accurate result we can solve equation [tex]2100*( \frac{1}{2})^x=600[/tex] but its very hard to solve without powerful tool.
