Final answer:
Ryan's offers a better buy for hand sanitizers at $6.50 per bottle, while JD's Supercenter sells them for $7.10 per bottle.
Step-by-step explanation:
To determine which store offers a better buy for hand sanitizers, we need to calculate the price per bottle for each store.
a) JD's Supercenter: 6 bottles for $42.60 - Price per bottle = $42.60 ÷ 6 = $7.10
b) Ryan's: 12 bottles for $78.00 - Price per bottle = $78.00 ÷ 12 = $6.50
Comparing the prices per bottle, Ryan's offers a better buy for hand sanitizers at $6.50 per bottle, while JD's Supercenter sells them for $7.10 per bottle.