Total = 83.39
Hat = 37.89
J = Jersey cost
0.7*J = Jersey cost + discount
T = H + 0.7J
[tex]\begin{gathered} T=H+0.7\cdot J \\ T-H=0.7\cdot J \\ J=\frac{T-H}{0.7} \\ J=\frac{83.39-37.39}{0.7} \\ J=\frac{46}{0.7} \\ J=65.71 \end{gathered}[/tex]The Jersey cost was $65.71