Question

It costs Rs. 5,000 to paint the total surface of a cube. But in summer, each side expands by 20%. What will be the cost of painting the cube in the summer?

Answer 1

surface area of the cube=6 a^2
so a is side 6*120/100*120/100a^2=216/25*a^2

Answer 2

150-216/25a^2

Answer 3

looks good so far
now lets find the cost
we know that 6a^2 = 5000

--> (1.2)^2 (6a^2) = new cost

--> (1.2)^2 *5000 = new cost

Answer 4

7200

Answer 5

yep