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SD 30% ⇒ ...pasang (dimisalkan x)
⇒ SD/SMP = 11%/30% = 50/x
⇔11/30 = 50/x (persen hilang sama" dikali 100%)
⇔ x = 11/30 . 50
⇔ x = 55/3
⇔ x = 18,3