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Step-by-step explanation:
L=110cm
B=85
H=25
thickness =5cm
internal dimension of bookshelf
=L=(110-5-5)=100
B=(85-5-5)=75
H=(25-5)=20
external surface area of bookshelf LB+2(BH+HL)
110+2(85*25 +25*110)
=19100cm square
surface area of the boarder
(4*75*5+110*5*2)
1500+1100
2600 CM square
total surface area to be polished
=19100+260=21700 cm square
cost of polishing outer surface
=21700*20/100
= Rs4340.
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