Multiple choice

Consider a cube of edge length 3 m. The cost of painting it red is Rs. 4.24 per sq.m and cost of painting it blue is Rs. 6.25 per sq.m. What is the total cost of painting the cube if 4 of its faces are to be painted red and remaining blue?

  1. Rs. 265.14

  2. Rs. 265

  3. Rs. 264.64

  4. Rs. 264.14

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Surface area of 1 face = 9 sq.m Surface area of 4 faces = 36 sq.m Therefore, cost of painting it red = Rs. (36 X 4.24) = Rs. 152.64 Also, total surface area of 2 faces = 18 sq.m Therefore, cost of painting 2 faces with blue colour = Rs. (18 X 6.25) = Rs. 112.5 Therefore, total cost = Rs. 265.14

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