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A retaining wall with measurements $30$ m $\times12$ m $ \times 6$ m was constructed with bricks of dimensions  $8$ cm $\times6$ cm $ \times 6$ cm. If $60\%$ of the wall consists of bricks,the number of bricks used for the construction is _______ lakhs.

  1. $30$
  2. $40$
  3. $45$
  4. $75$
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