CAT Quantitative Ability Questions | CAT Mensuration questions

CAT/1996

Question . 79

A closed wooden box of thickness 0.5 cm and length 21 cm, width 11 cm, and height 6 cm, is painted inside. The expenses of painting are Rs 70. What is the rate of painting in rupees per sq. cm.?

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Method of solving this CAT Quantitative Ability Question from Mensuration question