 
<translate> Hanyoyin tunani: A cikin watanni 6, Shara ta iya dawo da $ 10 x 6 = $ 60 ga dan uwanta. Tunda ta riga ta mayar da rabin kudin, to wannan yana nufin a halin yanzu tana bin ɗan'uwanta bashin $60. Wata huɗu daga yanzu, za ta iya biyan ƙarin $10 x 4 = $40. Saboda haka, za ta ci gaba da bin ɗan'uwanta bashin $60 - $40 = $20 bayan watanni huɗu daga yanzu. An bayyana tambayoyin da amsoshin da ke ƙasa. <eng> Stream of consciousness rationale: For 6 months, Shara was able to return $10 x 6 = $60 to her brother. Since she already returned half of the money, then this means she currently owes her brother $60. Four months from now, she will be able to pay an additional $10 x 4 = $40. Thus, she will still owe her brother $60 - $40 = $20 four months from now.
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