A cylindrical tank has its axis vertical. It is 2 m in diameter and its mass is 800 kg. When it is filled to 2 m high with oil, the total mass is 5050 kg. What is the relative density of the oil?
A. 6.312
B. 6.764 kg/m³
C. 6.764
D. 0.876
E. 0.6764
Answer: E