DHA$14$

Given the current density $J=-{10}^4[sin(2x)e^{-2y}{a}_x+cos(2x)e^{-2y}{a}_y]k\frac{A}{m^2},($a$)$ Find the total current crossing the plane $y=1$ in the $a_y$ direction in the region $J0by$ integrating $J.dS$ over the surface $of$ the cube$\mathrm{.}0.(b)$ Find the total current leaving the region $0by$ integrating $J.dS$ over the surface $of$ the cube.$($ this questions is from electro magnetic field theory and I need solutions in step by step$)$