1. (Area of the column A × Safe punching stress)/Load on column A
  2. (Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
  3. (Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
  4. None of these
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Answer: Option 2

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