# An open box is made of wood 3 cm thick.Its external dimensions are 1.46m,1.16m and 8.3dm.Find the cost of painting the inner surface of the box at75 paise per 100cm

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thickness = 3 cm

so,internal dimension will be (146-6)cm, (116-6)cm, and (83-6)cm

i.e. 140 cm, 110 cm and 77 cm

area of the inner surface = 2(140×110)+2(110×77)+2(140×77)

=30800 +16940 +21560 = 69300 cm²