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

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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=(1.5*100)/(5) \\ x=(150)/(5) \\ x=30\text{ \%} \end{gathered}

30% is the percentage of chance

User Hyun
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