Answer:
Powder 2
Explanation:
Convert to such a way that both quantities are the same:
Powder 1: 1250/9 = 137.7 c
Powder 2: 1790/14.5 = 123.4 c
By doing the above calculation, we have found the cost of 100g , for both powders. Now, compare and find
137.7 > 123.4
But, we're looking for cheapest value, so choose powder 2.
Hope this helps.