Answer: 19.2
Explanation:-
First find 1 pound for raspberries
40.15 / 15 = 2.68
Next find 1 pound for blueberries
25.80 / 15 = 1.72
Then you multiply both answers with 20
Raspberries for 20 pounds = 53.6
Blueberries for 20 pounds = 34.4
53.6 - 34.4 = 19.2
Byron pays 19.2 more