how to make a variable to be increasing and decreasing by a specified percentage over sections

    I  need  syntax  to  make  z  to be  increasing  and  decreasing by  2%  over  20 sections as inputs and  display   20  outputs  as  shown below :
    f = 100;
    z = 200  ;% how to make it to be increasing and decreasing by 2 %  over  20  sections 
    b = 2; c = 4;
    Y = f*b*c*z; 
    disp(Y);

Answer 1

[hossein]

Is it necessary to use 20 sections? Why not using a for loop?

f = 100;
b = 2;
c = 4;
for i = 1:20
    z = 200 * (1 - 0.02 * (i-10) );
    Y = f*b*c*z;
    disp(Y);
end

[segun]

You are right. Please send me the for loop method I will appreciate it. thanks