What is the effective radiated power (ERP) of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?

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The three losses total 4 dB + 3.2 dB + 0.8 dB = 8 dB, so the net figure is 10 dBd − 8 dB = +2 dB. Applying that to the transmitter output gives 200 W × 10^2/10 = 200 × 1.585 = 317 watts.