Final answer:
Ben paid A)$0.40 per pound of sugar he bought.
Step-by-step explanation:
To find out how much Ben paid per pound of sugar, we need to divide the total cost by the number of pounds of sugar. In this case, Ben paid $8 for 20 pounds of sugar. To calculate the cost per pound, we divide $8 by 20 pounds:
$8 / 20 pounds = $0.40 per pound
Therefore, Ben paid $0.40 per pound of sugar.