40% of 1620 = $$\frac{40 \times 1620}{100}$$ = $$ 648 $$
30% of 960 = $$\frac{30 \times 960}{100}$$ = $$ 288 $$
648 + 288 = 936
Let the unknown percentage be $$x$$.
$$ 936 = x \% of 5200$$
$$x = \frac{936 \times 100}{5200} = 18 $$
Hence option D is the correct answer.
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