The diagram represents a tank filled with sea water. The density of the sea water is $1020\ \text{kg m}^{-3}$. What is the pressure at point $P$ compared with atmospheric pressure?
- A$7400\ \text{Pa}$ above atmospheric pressure
- B$7500\ \text{Pa}$ above atmospheric pressure
- C$75\ 000\ \text{Pa}$ above atmospheric pressure
- D$82\ 000\ \text{Pa}$ above atmospheric pressure