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]
Formula: 1 Mark
Steps: 2 Marks
Answer: 1 Mark
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)
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.