Answer: A: $5, $2.50; $2.50 per pound B: 0.4 lb, 3.6 lb; 0.4 lb per dollarStep-by-step explanation:These tables are intended to represent proportional relationships. That means a couple of things:numbers in one row are some multiplier times the numbers in the other rowratios of numbers down the line are the same for each line.We can use the second fact to fill these tables quickly.__Part AIn the first table, the numbers in each column will be half the numbers in the column to its left. 2 pounds will have half the cost of 4 pounds, so will cost $51 pound will have half the cost of 2 pounds, so will cost $2.50It is convenient to use the column with a weight of 1 to find the multiplier: $2.50 per pound.__Part BIn the second table, the numbers in the second column will be 1/10 of those in the first column. The third column will be 9 times the second column.$1 will buy a weight 1/10 of what $10 will buy, so a weight of 0.4 pounds$9 will buy a weight 9 times what $1 will buy, so a weight of 3.6 pounds.Again, the multiplier is conveniently found where the cost is $1. It is 0.4 pounds per dollar._____Additional commentYou may notice that the first column is the same in each table. That is $2.50 per pound and 0.4 lb/dollar represent the same relationship.