Emma wants to buy pens and notebooks for her school's annual charity event. The price of a pen is $1.50 each, but if she buys a pack of 10 pens, the price is $12. The price of a notebook is $3 each, but if she buys a pack of 5 notebooks, the price is $13. If Emma needs 30 pens and 15 notebooks, how much money would she save by buying in bulk instead of buying each item individually? Let's think step by step and output the final answer within \boxed{}.
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