A Czochralski crystal is grown with an initial antimony concentration in the melt of 1 x 10¹⁶ cm^-3. After 70% of the melt has been used up in pulling the crystal, pure silicon is added to return the melt to its original volume. Growth is then resumed. What will the antimony concentration be in the crystal after 30% of the new melt has been consumed by growth? Assume k_o = 0.02 for antimony.