Question

Estimate the tip on a $31.77 check using a tip rate of 15%

Answer 1

$\bf \begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{15\% of 31.77}}{\left( \cfrac{15}{100} \right)31.55}\implies 4.7655$