Question

the inner circumference of a circular track is 440 metre and the track is 14 m wide calculate the cost levelling the track at 25paise per metre square also find the cost of fencing the outer boundary of the track at RS 5 per meter

Answer 1

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     

Answer 2

Answer:- Cost of fencing is Rs. 2640 and total cost of levelling the track is Rs. 1694.