A wave propagates 50m through a dielectric of region 1. Region 1 is lossy. Here, f= 0.6 Np/m. At an interface to region 2, the reflection coefficient is r =0.2+j0.5. The wave then propagates 50m back into region 1 from where it originated. After this round trip, what fractional power does the wave have compared to when it began?