If 49% of X = Y, then Y% of 50 is:

Answer: Option D

$$\begin{array}{rl}& \frac{X\times 49}{100}=Y\\ & \frac{X}{Y}=\frac{100}{49}\\ & 50\times Y\%\\ & =\frac{2\times 50\times 49\%}{2}\\ & =\frac{100\times 49\%}{2}\\ & =X\times 24.5\%\end{array}$$