Respuesta :
To solve the exercise, we can use a rule of three.
Part a)
[tex]\begin{gathered} 72\rightarrow100\text{\%} \\ x\leftarrow12.5\text{\%} \end{gathered}[/tex][tex]\begin{gathered} x=\frac{12.5\text{\%}\cdot72}{100\text{\%}} \\ x=\frac{12.5\cdot72}{100} \\ x=\frac{900}{100} \\ x=9 \end{gathered}[/tex]Therefore, 12.5% of 72 is 9.
Part b)
[tex]\begin{gathered} 72\rightarrow100\text{\%} \\ 63\leftarrow87.5\text{\%} \\ \text{ Because} \\ 87.5\text{\%}=100\text{\%}-12.5\text{\%} \\ \text{ and} \\ 63=72-9 \end{gathered}[/tex]Therefore, 87.5% of 72 is 63.
