Li Na can sign 12 autographs per minute, gets $5 for every autograph, and signs for 10 minutes per session.
Angelique Kerber can sign 4 autographs per minute, gets $9 for every autograph, and signs for 15 minutes per session.
Who takes in more money per autographing session?
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Li Na takes in 12 * 5 * 10 = $600 per session
Angelique Kerber takes in 4 * 9 * 15 = $540 per session