$${f_{nd} = f_{\text{öd}} \frac{v + v_n}{v + v_{\text{ö}}} \\ = (82,767\, \mathrm{kHz}) \frac{343\, \mathrm{m/s} - 9,00\, \mathrm{m/s}}{343\, \mathrm{m/s} - 8,00\, \mathrm{m/s}} \\ = 83,00\, \mathrm{kHz} \approx \underline{\underline{83,0\, \mathrm{kHz}}}}$$