Area of zari is 0.635 sq mt.
Area of the sari=6.875 sq mt.
After eliminating the zari border the length reduces to 5.2m from 5.5m and the width reduces to 1.2m from 1.25m.
Thus area of the inner sari=1.2*5.2=6.24 sq mt.
Therefore area of zari border=area of sari-area of inner sari=0.635 sq mt.