A submarine lies $20\,\text{m}$ below the sea surface. The pressure caused by the water at this depth is $P$. On another day, the submarine lies $26\,\text{m}$ below the surface of fresh water. The density of sea water is $1.3$ times the density of fresh water. What is the pressure caused by the fresh water at a depth of $26\,\text{m}$?
- A$\frac{P}{1.3}$
- B$P$
- C$1.3P$
- D$1.7P$