Question

Paul wants to tip the Waiter 15%. If the meal cost $20, how much is the tip?

Answer 1

$\bf \begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{15\% of 20}}{\left( \cfrac{15}{100} \right)20}\implies 3$

Answer 2

so do .15 times 20 when you get your answer you are then going to add it to 20 and that is your final answer
.