Answer
$325C_{16}$
Work Step by Step
Follow the procedure given in the textbook, we have:
11001001011100$\rightarrow$ 0011 0010 0101 1100
0011$\rightarrow$3
0010$\rightarrow$2
0101$\rightarrow$5
1100$\rightarrow$C
Juxtapose the above to get
$11001001011100_2\rightarrow 325C_{16}$