Question

(10) In a rectangular ground 40 m long long and 30 m wide, lawn of width 2 m is to be grown on all the four sides inside the ground. Find the cost of growing the lawn at the rate of 20 per square metre.​

Answer 1

Answer:

The cost of growing the lawn at the rate of 20 per square metre is ₹ 5280.

Step-by-step explanation:

Given the rectangular ground is 40m long and 30m wide

So, the area of the rectangular ground is the length × breadth,

i.e = 40 × 30

     = 1200$m^{2}$

Now it is said that a lawn of width 2m has to be grown on all four sides inside the ground

So, we need to find the area of the empty space

i.e, 40 - 4 = 36m and 30 - 4 = 26m

Area = 36 × 26

        = 936$m^{2}$

Now the area of the lawn is = area of rectangle - area of the empty space

                                              =  1200 - 936

                                              = 264$m^{2}$

Given, the cost of growing the lawn per square metre is = 20

So, the cost of the area of the lawn will be =  264 × 20

                                                                       = ₹ 5280.