Diameter of the cylinder = 35 mm = 3.5 cm => r = 1.75 cm
Height (h) = 7cm
Total Surface area of the one cylinder = 2πr( h +r )
= 2x3.14x1.75(7 + 1.75 )
= 96.162 cm2
Total area of 200 cylinders which need to be painted = 200x96.162
= 19232.5 square cm.