Question

The length of a room is 7 m and width is 4 m, if the cost of plaster is Rs 21.40 per sq.m. What will be the cost of

plaster on the entire floor?

A) Rs 607 b) Rs 599.20 c) Rs 590.40 d) Rs 550.50​

Answer 1

Steps :

• Here, we have to find the Area first.
• Then, we have to multiply the cost of plastering with the area.

Given :

• The length of the room = 7 m
• The breadth of the room = 4 m
• Cost of plaster = Rs.21.40

To find :

• the cost of  plaster on the entire floor

Solution :

⇒ Let's find the Area of the floor.

Area of the Floor = l × b

                            = 7 × 4

                            = 28 m²

⇒ Now, let's find the cost of plastering the entire floor.

Cost of Plastering = 28 × 21.40

                              = 599.20

Therefore, option (b) Rs.599.20 is the right option.

Answer 2

Answer::37. The length of a room is 7 cm and breadth 4 cm if the cost of plaster is Rs. 21.4. per square meter, what will be the cost of plaster on the whole floor?