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1/Rp = 1/30 + 1/60
1/Rp = (2+1)/60
1/Rp = 3/60
Rp = 60/3
Rp = 20 Ω
R total = R₁ + R₂ + Rp
R total = 8 + 2 + 20
R total = 30 Ω
V = R x I
V = 30 x 0,4
V = 12 Volt
Jadi, beda potensial pada rangkaian tersebut adalah 12 Volt (Jawaban C)