Answer:
Step-by-step explanation:
The number of dollars Left always needs to be even if you want to buy albums last because we can never have half an album. So if you download 4 songs that leaves you left with $8.
0.25x4
=1
Now with the rest of the money you can download 4 albums.
4 individual songs, 4 albums.
0.25x4+4x2
=1+8
= $9
12 individual songs, 3 albums
0.25x12+2x3
= 3+6
=$9
20 individual song, 2 albums
0.25x20+ 2x2
= 5+4
= $9
