$\begin{array}{l}\text{Here, it can be written as}\\ \Rightarrow \frac{185}{100}\times 400+\frac{35}{100}\times 240=?\%\text{\hspace{0.17em}\hspace{0.17em}of 1648}\\ \\ \left[\text{put ?=x}\right]\\ \\ \Rightarrow \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}185}\times \text{4 + 35}\times \text{2.4 = }x\text{\hspace{0.17em}\% of 1648}\\ \\ \Rightarrow \text{740 + 71.40 =}\frac{x}{100}\times 1648\\ \\ \Rightarrow \text{811.40 =}\frac{x}{100}\times 1648\\ \\ \Rightarrow x=\frac{81140}{1648}\\ \\ \Rightarrow \text{ 49235 =50}\end{array}$

Hence, Option D is correct.