please write a persudo code explaing the code steps

Problem 1 The pressure-drop p (in Pa) for a fluid flowing in a pipe with a sudden increase in diameter is given by: 2 where p is the density of the fluid, v, the velocity of the flow, and d and D are the diameters of the pipes. Write a program in a script file that calculates the pressure-drop Ap. Use p 700 kg/m3 at5m/s and the ratios of diameters: d/D-0.9,0.8,0.7,0.6,0.5,0.2