Find the binding energy per nucleon for ${ }_{50}^{120} \mathrm{Sn}$. Mass of proton $m_p=1.00783 \mathrm{U}$, mass of neutron $m_n=1.00867 \mathrm{U}$ and mass of tin nucleus $m_{S n}=119.902199 \mathrm{U}$. (take $1 \mathrm{U}=$
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