In which year the percentage of production of Company Z to the production of company Y is maximum ?

Answer: Option B

Explanation:

The percentages of production of Company Z to the production of Company Y in various years is as:
Note: Small thing which should always be taken care of, is to find percentage of which company to which company, I mean the order. As in this question Company Z to the Company Y.
So lets solve it,
\begin{aligned}
\text{for 1996 =}\left(\frac{35}{25}*100 \right)\% \\
= 140\% \\
\text{for 1997 =}\left(\frac{40}{35}*100 \right)\% \\
= 114.29\% \\
\text{for 1998 =}\left(\frac{45}{35}*100 \right)\% \\
= 128.57\% \\
\text{for 1999 =}\left(\frac{35}{40}*100 \right)\% \\
= 87.5\% \\
\text{for 2000 =}\left(\frac{35}{50}*100 \right)\% \\
= 70\% \\

\end{aligned}

So for 1996 the percentage is highest.