Final answer:
The cost qn in euros to purchase and ship n purses is given by the formula qn = 56(55n + 3), using the provided conversion rate and cost formula.
Step-by-step explanation:
To write a formula for the cost qn in euros to purchase and ship n purses, we first need to convert the cost from dollars to euros using the provided conversion formula rd = 56d, where d is the number of dollars and rd is the value in euros.
Additionally, we have the cost in dollars pn to purchase and ship n purses given by pn = 55n + 3. By replacing the d in the conversion formula with the given pn, we get rd = 56(55n + 3).
Therefore, the cost qn in euros to purchase and ship n purses is given by:
qn = 56(55n + 3)