A closed wooden box of thickness 0.5 cm and length 21 cm, width 11 cm, and heigh

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

A. 0.7
B. 0.5
C. 0.1
D. 0.2

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