Question

wessam orders a meal that costs $15. there is no tax on the meal, and wessam decides to tip 20%. select the expression that represents the total cost, in dollars, including the tip. 15 + 0.20 15 + 1.20 15·0.20 15·1.20

Explanation:

Step1: Understand the tip calculation

The tip is 20% of the meal cost. To find the total cost, we need to add the meal cost and the tip. The tip amount is \( 20\% \) of \( 15 \), which is \( 0.20\times15 \). The total cost is the meal cost plus the tip, so it can also be thought of as the meal cost multiplied by \( (1 + 0.20) \) because we are paying 100% of the meal cost plus 20% tip, which is 120% or \( 1.20 \) in decimal form.

Step2: Analyze each option

• Option \( 15 + 0.20 \): This adds $0.20 to $15, which is not 20% tip (20% of 15 is $3, not $0.20).
• Option \( 15 + 1.20 \): This adds $1.20 to $15, which is not 20% tip (20% of 15 is $3, not $1.20).
• Option \( 15\cdot0.20 \): This calculates just the tip amount, not the total cost.
• Option \( 15\cdot1.20 \): This multiplies 15 by 1.20, which is equivalent to \( 15+0.20\times15 \), giving the total cost including tip.

Answer:

\( 15\cdot1.20 \)