The total cost of downloading 20 songs is $45.
The total cost of downloading ss songs is $15 + $1.5ss.
The total cost of the of downloading songs is the sum of the fee per month and the cost of downloading songs.
Total cost of downloading 20 songs = cost per month x cost of downloading 20 songs
$15 + ($1.50 x 20)
$15 + $30
$45.
Total cost of downloading ss songs = $15 + ($1.50 x ss)
$15 + $1.5ss
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