Answer :
B) 380mm
Surface area = Perimeter of the base x height + the area of the base
Surface area = 40 x 8 + 60
Surface area = 320 + 60
Surface area = 380 mm
Surface area = Perimeter of the base x height + the area of the base
Surface area = 40 x 8 + 60
Surface area = 320 + 60
Surface area = 380 mm