//Example 1.33
clc
disp("We know that,")
disp("A_vf = A_v / 1+beta*A_v")
disp("Therefore,  A_vf + beta*A_v*A_vf = A_v")
b=20/2400
format(8)
disp(b,"Therefore,  beta = A_v-A_vf / A_v*A_vf =")