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R pararel = 10
R seri atau R pengganti =40 + 10 + 50
=100
total R seri di dalam paralel = R4 + R5 = 10 + 20 = 30 ohm
1/R total paralel = 1/20 + 1/30 + 1/60 = 3+2+1/60 = 6/60
R total paralel = 60/6 = 10 ohm
R total (hambatan pengganti seluruh hambatan) = 10 ohm + 40 ohm + 50 ohm = 100 ohm
jawabannya C