Answer: C. Blueberries are $0.80 per pound less at the farmer's market
Explanation:
At the store per ounce the blueberries are $0.35. ($2.80 price/8 ounces)
At the farmers market per ounce the blueberries are $0.30. ($4.20 price/14 ounces)
There are 16 ounces in a pound. Store=$0.35 x 16 = $5.60; Market = $0.30 x 16 = $4.80
They cost less at the farmer's market. $5.60-$4.80 = $0.80