A certain restaurant that regularly advertises through the mail has 1,040 cover letters and 3,000 coupons in stock .In its next mailing ,each envelope will contain 1 cover letters and 2 coupons .If all of the cover letters in stock are used ,how many coupons will remain in stock after this mailing?
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A920
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B1040
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C1500
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D1960
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E2080