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Mohan is a carpenter who specialises in making chairs. For every assignment he undertakes, he charges his commision and cost. His commission is fixed and equals $ ₹560$ per assignment while the cost equals $ ₹2n^2$ where, $n$ is the total number of chairs he makes. If for a certain assignment the average cost per chair is not more than $₹68$, then the minimum and maximum possible number of chairs in the assignment are, respectively.

  1. $13\:\text{and}\:19$
  2. $13\:\text{and}\:20$
  3. $14\:\text{and}\:19$
  4. $14\:\text{and}\:20$
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