Question

Please solve this question

Answer 1

Pillar is in the form of cylinder
CSA of cylinder=2πrh
height(h)=3m
radius(r)= 40/2= 20
            = 20*1/100=0.2m
CSA = 2πrh
          (2*3.14*0.2*20)
           (6.28*4)
          = 25.12m sq.
Cost of white washing 1m sq= Rs.26.50
Cost of white washing 25.12m sq.= 25.12*26.50
                                                     = Rs.665.6800
                                                               or
                                                     = Rs.665.68