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n = 120% --> 120/100 --> 6/5
p = 2 4/5 --> 14/5
m × n = 10/7 × 6/5 = 12/7 --> 1 5/7 (salah)
m × p = 10/7 × 14/5 = 4 (salah)
m : p = 10/7 : 14/5 = 10/7 × 5/14 = 25/49 (salah)
n : p = 6/5 : 14/5 = 6/5 × 5/14 = 3/7 (benar)
Jadi, jawaban yg benar adalah (D) 3/7