Question

please solve the question fastly

Answer 1

see the picture,
       radius of circular park ( r) = 140/2 = 70 m
       width of path ( d) = 7 m
now, radius of outside = ( r + d) = 70 + 7 = 77m
       radius of inside = 70 m

now, distance of total  of path = 2π{(r+d) + r}
                                            = 2π{77+ 70} = 14π = 147*2*22/7 = 924m 

hence, total cost = 924m × 7Rs/m =  6468 Rs