We have that one pound of bananas cost $0.59. Let 'x' be the number of pounds and let 'y' be the total cost. Then, we can write the following expression:
a)since x and y have a proportional relationship, the constant of proportionality is 0.59
b) To find out how much it will cost 25 pounds of bananas, we can make x = 25 and solve for y:
therefore, 25 pounds of bananas will cost $14.75