At one farmer’s market, bananas cost $0.80 per pound. at another farmer’s market, bananas are sold in 5-pound bags for $4.50 per bag. which explains how to find the better buy? divide 4.50 by 5 to find the unit rate for the 5-pound bag, and compare that number to $0.80 per pound. divide 0.80 by 5 to find the unit rate for the 5-pound bag, and compare that number to $0.80 per pound. multiply 4.50 by 5 to find the cost for 5 pounds, and compare to $4.50 per bag. multiply 4.50 by 0.80 to find the cost for 5 pounds, and compare to $4.50 per bag.\