A customer performs a full back up on the primary Sunday of the month adopted by a cumulative backup on the opposite Sundays. In addition they carry out an incremental backup every day Monday by Saturday. Tapes are despatched offsite for catastrophe restoration each morning at 10 a.m. The customer experiences a system crash on the Wednesday of the third week at three p.m., requiring a system restoration. What number of days of price of tapes must be retrieved to carry out a restoration

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