Question

# A cubical container of side $$3.5$$m is to be painted both inside and outside. Find the area to be painted and the total cost of painting it at the rate of Rs $$75$$ per square meter.

Solution

## T.S.A of cube $$= 6a^2$$                        $$= 6 \times 3.5 \times 3.5$$                        $$= 6 \times 12.25= 73.5 m^2$$Since we have to paint inside and outside therefore total area $$= 73.5 \times 2 = 147 m^2$$Now we know that cost of painting  $$= Rs. 75$$  per $$m^2$$Cost of painting for $$147m^2$$ $$= 147 \times 75 = Rs. 11025$$Mathematics

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