Final answer:
The cost per basket of blueberries is $12.
Step-by-step explanation:
To find out how much each basket of blueberries cost, we first need to determine the total number of blueberries in the baskets. If one basket fell and half of the berries were scattered, then there were still 7 full baskets of blueberries remaining. Since the remaining full baskets sold for $84, we can divide this amount by the number of baskets to find the cost per basket.
Mathematically, we can set up an equation: $84 / 7 baskets = $12 per basket.
Therefore, each basket of blueberries cost $12.