Water is flowing steadily through a horizontal tube of non-uniform cross-section. If the pressure of water is $4 \times 10^4\,\text{N/m}^2$ at a point where cross-section is $0.02\,\text{m}^2$ and velocity of flow is $2\,\text{m/s}$, what is the pressure at a point where cross-section reduces to $0.01\,\text{m}^2$?