Question

13. The inner circumference of a circular track is 440 m, and the track is
14 m wide. Calculate the cost of ievelling the track at 25 paise/m. Also,
find the cost of fencing the outer boundary of the track at 5 per metre.
25 m ​

Answer 1

Answer:

Let the smaller radius be r and bigger radius = R

inner circumference= 440m

             2*22/7*r= 440m

                          r=70m

R= 70+14= 84m

area of track= area of bigger circle - area of smaller circle

                     = pie R^2 -pie r^2

                      = 2146m

cost of levelling = 25 paise/m

cost = 13412.5 rupees

circumference of bigger circle = pie R^2

                                                     = 22176m

cost = 5*22176

         = 110880 rs

I HOPE IT IS CORRECT AND HELPFUL FOR U     

Read more on Brainly.in - https://brainly.in/question/2215249#readmore

Answer 2

Let the smaller radius = r

bigger radius = R

inner circumference= 440m

             2*22/7*r= 440m

                          r=70m

R= 70+14= 84m

area of track= area of bigger circle - area of smaller circle

                     = pie R^2 -pie r^2

                      = 2146m

cost of levelling = 25 paise/m

cost = 13412.5 rupees

circumference of bigger circle = pie R^2

                                                     = 22176m

cost = 5×22176

         = 110880

The cost of fencing the outer boundary of track at 5 per metres is RS110880..