for manchester encoding: baud rate(B)= 2* bit rate(b1)-------(ii)
for NRZ encoding : baud rate(B)=bit rate(b2)------(i)
now it is given that baud rate is fixed
now dividing (i) by (ii) we get;
b2=2*b1
so b1=(1/2) b2
ie manchester encoding communication bit rate is half as fast as NRZ encoding