Consider steady-state heat conduction across the thickness in a plane composite wall (as shown in the figure) exposed to convection conditions on both sides.

Given: h_i = 20W / m² k; h₀ = 55 W / m²K; $T_{\infty, 0}$= 2⁰C; k₁ = 20W / mk; k₂ = 500 W / mk; L₁ = 0.30 m and L₂ = 0.15 m. Assuming negligible contact resistance between the wall surfaces, the interface temperature, T (in °C), of the two walls will be