so you and your brother went for dinner, your meals cost is 6.35+7.50
now, here cometh the taxman, that's 13.85, and the tax on that is 7.25%
how much is 7.25% of 13.85? well, if we take 13.85 as the 100%
then [tex]\bf \begin{array}{ccllll}
amount&\%\\
\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\
13.85&100\\
x&7.25
\end{array}\implies \cfrac{13.85}{x}=\cfrac{100}{7.25}[/tex]
solve for "x"
now, that's how much 7.25% is of 13.85
so, the bill that was handed out to you both was 13.85 + x
what about the 15% tip? the tip is not part of the bill
