Question

Ken saves $140 per month. If this is 2.5% of his monthly income, how much does he earn per month

Answer 1

so, he earns "x", which is the 100%, now, we know 140 is 2.5%, so, what is "x"?

well
`\bf \begin{array}{ccllll} amount&\%\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ x&100\\ 140&2.5 \end{array}\implies \cfrac{x}{140}=\cfrac{100}{2.5}`

solve for "x"