Question

In the spring the height of a vine was 15 inches in the fall the height of the fine was 120 inches what was the percent of increase

Answer 1

If we take 15 as the 100%, then, what the dickens is 120 in percentage of that?

well  $\bf \begin{array}{ccllll} amount&\%\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 15&100\\ 120-15&x \end{array}\cfrac{15}{120-15}=\cfrac{100}{x}$

solve for "x"