Solve the following problem:
A satellite in synchronous orbit is used to communicate with an earth station at a distance of 40,000 km. The satellite has an antenna with a gain of 15 dB and a transmitter power of 3 W. The earth station uses a 10-m parabolic antenna with an efficiency of 0.6. The frequency band is at f = 1 GHz. Determine the received power level at the output of the receiver antenna.