Final answer:
Mary spent a total of $745 on magazine subscriptions, as stated in the question. Therefore, we cannot determine the total amount Mary spent on magazine subscriptions with the given information.
Step-by-step explanation:
The total amount Mary spent on magazine subscriptions was $745. This figure is directly provided in the question and does not require additional calculation or consideration of her weekly budget for magazines and pies, which is a separate detail not relevant to this expenditure.
To find the total amount Mary spent on magazine subscriptions, we need to know the cost per subscription and the number of subscriptions she bought. The problem provided does not give us this information and instead presents unrelated information about a different person named Marie and her budget for magazines and pies. Therefore, we cannot determine the total amount Mary spent on magazine subscriptions with the given information.