In order to know which one is greater, let's convert the fractions and 84% into a number with 2 decimal places, then:
[tex]\begin{gathered} \frac{43}{50}=0.86 \\ \frac{7}{8}=0.88 \\ \frac{84\text{ \%}}{100\text{ \%}}=0.84 \end{gathered}[/tex]And we also have 0.91.
Then, as can be seen, the greater number is 0.91.