need help with percentage??

Prompt the user to enter to projected percent reduction in artic ice thickness a year after the last recorded day (0 – 100%). Create a user-defined function named Projection_cougarnetID.m. In the function, determine the projected ice thickness a year after the last recorded day for each location. This function will have two inputs (projected percent reduction, updated ice data from Task 2) and one output (vector of projected ice thicknesses for each location). In your main script, append the projected ice thicknesses to the Ice matrix and save that new matrix as MA2_Task4.csv.