A vertical cylindrical tank 1 m in diameter and 3 m tall weighs 3.86 kN. Which of the following most nearly gives the weight of the lead (unit weight =110 kN/m3) that must be placed inside the tank to make the top of the tank flushed with the water surface? Choose a match. 21.14 KN 16.91 KN 15.40 KN 13.21 KN 19.25 KN