Question

A cylindrical vessel open at the top has a diameter of 20 cm and a height of 14 cm. Find the cost of tin plating it on the inside at the rate of Rupee 1 per 100 cm square.

Answer 1

r=10cm
h=14cm
area to be painted =csa of cylinder+base area of cylinder
                              =2pirh+pir2
                              =2*22/7*10*14+22/7*10*10
                               =880+314.7
                               =1194.7cm2
 cost of tin plating=1194/100*1
                             =rs.11.94
                              =Rs.12