We know [tex] 1\;L=1000\;mL [/tex] and [tex] 1\;kL=1000\;L=1000000\;mL [/tex]. Hence,
[tex] 0.048\;kL=0.048(1000000)=48000\;mL [/tex]
[tex] 4.8\;L=4.8(1000)=4800\;mL [/tex]
Since [tex] 4800\;mL<9000\;mL<48000\;mL [/tex]
The quantities in ascending order is
Since [tex] 4.8\;L<9000\;mL<0.048\;kL [/tex]