Respuesta :

apologiabiology
so assuming to solve for rate
12 for 3
divide
12/3=4
$4 per 1 book

28 for 7
divide
28/7=4
$4 per book

the rate is $4 per paperback book
SugoiPlatypus
12/3=4
28/7=4
So 4$ for a paperback book.

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