length of the outer edge of a closed box are respectively 25 CM 23 CM and 18cm if thickness of the wood be to 2 CM then find (I) the total internal surface and the cost of painting the internal surface at the rate of 50 paise per cm^2
(ii) cost of the total would at the rate of 1 per cm^2
ANSWER = (I) 1918cm^, rupees 959 (ii) rupees 4764
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