ANSWER:
It is better to buy it now, that is, a few weeks after the first purchase since it is cheaper ($12.95 for a 6,35 kg bag)
Explanation:
We must calculate the unit price in each case. We calculate the unit value by dividing the price by the quantity in kg, like this:
Saying that before the price was $ 2.08 per kilogram and later it is $ 2.04 per kg.
The best sale is $12.95 for a 6,35 kg bag