Question

James and Sarah went out to lunch. The price of lunch for both of them was $20. They tipped their server 15% of that amount.

Answer 1

Answer:

Each person paid $7.67

Step-by-step explanation:

Total price of lunch = $20

They tipped their server 15% of that amount.

Amount of tip =$15\% \times 20 = \frac{15}{100} \times 20 = 3$

Total price of lunch including tip = 3+20=$23

Now James and Sarah shared the price of lunch and the tip equally

Each person paid amount =$\frac{23}{3}=7.67$

Hence each person paid $7.67

Answer 2

$\bf \begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{15\% of 20}}{\left( \cfrac{15}{100} \right)20}\implies 3~\hfill \begin{array}{llll} \stackrel{\textit{price + tip}}{20+3\implies 23}\\\\ \stackrel{\textit{each one paid half of 23}}{11.5} \end{array}$