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Mathematics, 23.09.2020 01:01 CatelynBGray

Sydney subscribes to an e-book service. Her subscription costs a flat fee of $20 for up to 10 e-book downloads each month. For each download over 10 ,there is an additional charge per download. During the month of September ,Sydney downloaded 20 e-books and was charged $90. How much does each additional download cost?

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