Question

Sally is in a long jump competition. Her first jump is 5m. Her second jump is 6.5m. What is her percentage of change?

Answer 1

First we need to know the difference between the two jumps

$6.5m-5m=1.5m$

now, we look for the equivalent percentage of 1.5 with respect to 5

we can say 5 is 100% an apply Cross-multiplication

$\begin{gathered} 5\longrightarrow\text{ 100\%} \\ 1.5\longrightarrow x\text{ \%} \end{gathered}$

solve the cross-multiplication

$\begin{gathered} x=\frac{1.5\times100}{5} \\ x=\frac{150}{5} \\ x=30\text{ \%} \end{gathered}$

30% is the percentage of chance