Answer: The percent of decrease= 20 %.
Explanation:
Regular price of blueberries= $3.50per pint
Current selling price=$2.80 per pint
Clearly, there is decrease in price as 'Current selling price' < 'Regular price'
Now, Decrease in price=Regular price-Current selling price

We know that Decrease percentage =


Therefore, the percent of decrease= 20 %.