[tex]\text {Answer:}[/tex]
[tex]\huge\boxed{\sf 5}[/tex]
[tex]\text {Step-by-step~explanation:}[/tex]
[tex]\bold {4.5~ / ~90 \times 100}[/tex]
[tex]\bold {(4.5 \times 100) ~/~90}[/tex]
[tex]\bold {450~ /~ 90 }[/tex]
[tex]\bold {= 5 }[/tex]
