Aunt Wang bought 4 Jin of apples and 5 Jin of bananas to go to 28 yuan, and Uncle Li bought 2 Jin of apples and 3 Jin of bananas, which cost 15.8 yuan. How much is a banana per kilogram?

Let the unit price of apples be X yuan and bananas be Y yuan.

Judging from the meaning of the question:

4x+5y=28

2x+3y= 15.8

Solving equation: x=2.5

y=3.6

Bananas are 3.6 yuan per kilogram.

Let the unit price of apples be X yuan, and the unit price of bananas be (28-4x)/5 yuan.

Judging from the meaning of the question:

2x+3×(28-4x)/5= 15.8

Solving equation: x=2.5

Unit price of banana (28-4x)/5 = (28-4x 2.5)/5 = 3.6.

A: Bananas are 3.6 yuan per kilogram.

Let's assume that the unit price of bananas is X yuan and that of apples is (28-5x)/4 yuan.

Judging from the meaning of the question:

2×(28-5x)/4+33= 15.8

Solving equation: x=3.6

A: Bananas are 3.6 yuan per kilogram.