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Manu earns ₹$4000$ per month and wants to save an average of ₹$550$ per month in a year. In the first nine months, his monthly expense was ₹$3500$, and he foresees that, tenth month onward, his monthly expense will increase to ₹$3700$ . In order to meet his yearly savings target, his monthly earnings, in rupees, from the tenth month onward should be

1. $4350$
2. $4400$
3. $4300$
4. $4200$

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