3. Dena ordered a \( \$ 8.40 \) meal and Jules ordered a \( \$ 9.20 \) meal. If the sales tax is \( 8 \% \) and they leave a \( 20 \% \) tip on the price of the meal including tax, then what is the total?

**Step 1: Calculate the total cost before tax** The meal for Dena is \( \$8.40 \) and the meal for Jules is \( \$9.20 \). The total cost before tax is \[ 8.40 + 9.20 = 17.60 \] **Step 2: Calculate the sales tax** The sales tax is \( 8\% \) of the total cost. Thus, \[ \text{Tax} = 0.08 \times 17.60 = 1.408 \] **Step 3: Determine the cost including tax** Add the tax to the meal cost: \[ 17.60 + 1.408 = 19.008 \] **Step 4: Calculate the tip** The tip is \( 20\% \) of the cost including tax. So, \[ \text{Tip} = 0.20 \times 19.008 = 3.8016 \] **Step 5: Calculate the total cost** Add the tip to the cost including tax: \[ 19.008 + 3.8016 \approx 22.8096 \] Rounded to the nearest cent, the total cost is approximately \[ \$22.81 \]