T1=1*5*10*1;
T2=1*10*1;

L1=10*(-1);
L2=1*(-2);
L3=5*10*1*(-1);
L4=10*1*(-1)

delta=1-(L1+L2+L3+L4)+(L1*L4)
del1=1;
del2=1-L1;

TF=(T1*del1 + T2*del2)/delta ;
disp(TF,"C/R = ")