Question

# A man wants to paint two of his walls. The cost of painting is Rs10 per cm2. How much money is required by him to paint a rectangular wall of length 400 cm and breadth 900 cm and a circular wall of diameter 126 cm? [4 MARKS]

Solution

## Formula: 1 Mark Steps: 2 Marks Answer: 1 Mark Given that  The cost of painting is Rs10 per cm2. The length of the rectangular wall=400 cm The breadth of the rectangular wall=900 cm Area of the rectangle =  length × breadth On substituting the values we get Area of the rectangle = (400) × (900)   = 360000 cm2 Money required to paint the rectangular wall = (10) × (360000) = Rs.3600000 The diameter of the circular wall = 126 cm. Radius of the wall, r = 1262 = 63 cm The area a circle is given by, Area = π×r2 On substituting the values we get, Area of the circular wall = 227×63×63 = 12474 cm2 Money required to paint the circular wall  = 12474×10 = Rs 124740 The total cost of painting = 3600000 + 124740 = Rs 3724740 Hence, the total cost of painting the walls is Rs 37,24,740.

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