Lisa has a rectangular garden that measures 15 meters in length and 10 meters in width. She plans to add a decorative fence around the perimeter of her garden. The fencing material costs $8 per meter. However, she gets a discount of $2 per meter for any length over 30 meters. How much will Lisa spend on the fencing material? Let's think step by step and output the final answer within \boxed{}.
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