Final answer:
After calculating the price per kilogram for both options, the 3 kilograms bag of red onions at $7.14 is a better buy at $2.38 per kilogram, compared to the 7 kilograms bag at $16.87, which is $2.41 per kilogram.
Step-by-step explanation:
Comparing Prices of Red Onions
To determine which purchase option for red onions is better, we need to calculate the price per kilogram for each option.
For the 3 kilograms bag at $7.14, we calculate the price per kilogram as follows:
Price per kilogram = Total price / Total weight
Price per kilogram = $7.14 / 3 kg = $2.38 per kilogram
For the 7 kilograms bag at $16.87, we calculate the price per kilogram in the same way:
Price per kilogram = Total price / Total weight
Price per kilogram = $16.87 / 7 kg = $2.41 per kilogram
Now that we have the price per kilogram for both options, we can compare them directly. The 3 kilograms bag of red onions is slightly cheaper per kilogram than the 7 kilograms bag.