Question

solve this question define in brief ​

Answer 1

Hi mate here is the answer:-✍️✍️

Answer:

Given,External dimensions of wooden shelf =

85cm×25cm×110cm

Thickness of plank =5 cm

so,

Area to be polished= area of 4 walls + area of black+ area of front breading

=[2(110+85)×25+110×85+(75×5)×5]

=21700 cm^2

Cost of polishing at rate of 20 paise per cm^2

=21700×20/100

=Rs.4340

Internal surface area=area of 5 faces of 3 cuboid each of dimension

=(75cm×30cm×20cm)

Total surface area of 3 cuboid

=3[2(75×30+30×20+20×75)]-3(75×30)

=19350cm^2

since, cost of painting at rate 10per cm^2

=19350cm^2×10/100

=Rs.1935

Hence, total expense = Rs.(4340+1935)

=Rs.6275

Hope it helps you ❣️☑️☑️