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In the following chart, the price of logs shown is per cubic meter and that of plywood and saw timber is per ton. Given that $1$ cubic meter of Plywood and Saw Timber = $800$ kg ($1$ ton = $1000$ kg)

If $1$ cubic meter = $700$ kg for Plywood, in which year was the difference in the prices of plywood and saw timber the minimum?

  1. $1989$
  2. $1990$ 
  3. $1991$ 
  4. $1992$

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