Answer:
D = $0.38 per pounds
Explanation:
It is given that,
Last month the local YMCA bought 2pounds of French fries for $4.56 for summer camp.
The next month they purchased 12 pounds of French fries for $22.80.
Unit cost per pound for last month is :

Unit cost per pound for the next month is :

Taking difference,
D = C - c
D = $2.28-$1.9
D = $0.38 per pounds
So, the difference that the YMCA during summer camp is $0.38 per pounds.