Description for Correct answer:
Given, 0.764y = 1.236x

=>\( \Large \frac{y}{x}=\frac{1.236}{0.764} \)

Now, \( \Large \frac{y-x}{y+x}=\frac{y/x-1}{y/x+1} \)

=>\( \Large \frac{\frac{1.236}{0.764}-1}{\frac{1.236}{0.764}+1}=\frac{1.236-0.764}{1.236+0.764}=\frac{0.472}{2.000} \)

= 0.236