Answer
$U_n = 4.81 \space MeV/nucleon$
Work Step by Step
By dividing the Total Electric Potential Energy (U) with Number of Nucleon (A), we get the Electric Potential energy per nucleon.
$U_n = \frac{U}{A}$ Where A = 239
$U_n = \frac{1.15 \space GeV}{239}$
$U_n = 4.81 \space MeV/nucleon$
