Answer:
28-kilogram package
Explanation:
From the two options provide the baker should buy the 28-kilogram package. This package would make it so that the baker can make his batches and no sae would be left. The 28-kilogram package has 28,000 grams of sea salt, which evenly divides by the 70 grams of each batch
28,000 / 70 = 400
On the other hand the 1,500 gram package does not evenly divide by 70 grams which would mean that there would always be sea salt left over.