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The staff reading taken on a workshop floor using a level is $0.645$ m. The inverted staff reading taken to the bottom of a beam is $2.960$ m. The reduced level of the floor is $40.500$ m. The reduced level (expressed in m) of the bottom of the beam is

  1. $44.105$
  2. $43.460$
  3. $42.815$
  4. $41.145$
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