Final answer:
Robbie has 40% of his 20-ounce soda left after drinking 12 ounces. This is calculated by dividing the remaining ounces (8) by the total ounces (20) and multiplying by 100.
Step-by-step explanation:
The question asks what percentage of a 20-ounce soda is left after drinking 12 ounces. To find the percentage, first calculate the remaining ounces by subtracting 12 from 20, which is 20 - 12 = 8 ounces left. Then, to get the percentage, divide the remaining ounces by the total ounces and multiply by 100:
Percentage left = (Remaining ounces / Total ounces) × 100
Percentage left = (8 / 20) × 100
Percentage left = 0.4 × 100
Percentage left = 40%
Therefore, the correct answer is A) 40%.