\(A\) pounds of apples cost \(c\) dollars. At this rate, how many dollars will \(y\) pounds of grapes cost?

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Set up a proportion the same way you would treat it if there were numbers instead of variables:

$$ \frac{A \text{ pounds}}{c \text{ dollars}} = \frac{y\text{ pounds}}{? \text{ dollars} } $$ $$ A \cdot ? = yc $$ $$ ? = \boxed{\frac{yc}{A}} $$