Question

An open box is made of wood 3cm thick its external length is1.46meter, breadth 1.16meter and hight 8.3dm. The cost of painting the inner surface of the box at 50 pise per 100cm2

Answer 1

HEY DEAR ... ✌️


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External Length = 1.46 m
Inner Length = 1.46 m - (0.3 m + 0.3 m) 
= 1.40 m or 140 cm

External Breadth = 1.16 m
Inner Breadth = 1.16 m - (0.3 m + 0.3 m)
= 1.10 m or 110 cm

External Height = 8.3 dm or 83 cm
Inner Height = 83 cm - 3 cm = 80 cm

Cost of painting = 75 paise per 100 sq cm

Cost of painting the bottom from inside = 140*110*(75/100)
= 11550 paise or  Rs.115.50

Cost of painting the four sides = (2*140*80 + 2*80*110)*(75/100)
= (22400 + 17600)*(75/100)
= (40000*75)/100
= 30000 paise or Rs. 300

Total cost of painting from inside = Rs. 115.5 + Rs. 300 
= Rs. 415.50 



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HOPE , IT HELPS ... ✌️