Question

Problem 8a) 0.125 = 1/8, find 12.5% of 72,b) 87.5 = 100 -12.5, find 87.5% of 72,

Answer 1

To solve the exercise, we can use a rule of three.

Part a)

`\begin{gathered} 72\rightarrow100\text{\%} \\ x\leftarrow12.5\text{\%} \end{gathered}`
`\begin{gathered} x=\frac{12.5\text{\%}\cdot72}{100\text{\%}} \\ x=(12.5\cdot72)/(100) \\ x=(900)/(100) \\ x=9 \end{gathered}`

Therefore, 12.5% of 72 is 9.

Part b)

`\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}`

Therefore, 87.5% of 72 is 63.