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Explanation:

If Rashid’s savings fill his deficit for n months,

60000 = n2[4000 + (n - 1)500]

∴ n2 + 7n - 240 = 0

∴ n ≈ 12.38

∴ Rashid savings last for 12 months, after which he has to start borrowing from the 13th month.

Hence, option (d).

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