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Option 3 : Rs. 281250

Principal = Rs. 500000

Since first three instalments are 1/4th of the principal amount;

∴ Value of each instalment = 500000/4 = Rs. 125000

We need to calculate the cumulative principal for 4 years∶

Since Rs. 125000 is paid in first 3 instalments that means principal is decreasing by Rs. 125000 each year∶

∴ Cumulative Principal = 500000 + 375000 + 250000 + 125000 = Rs. 1250000

∴ Simple interest over the course of 4 years = /100 = Rs. 156250

∴ Amount paid by Ishan in the last instalment = 125000 + 156250 = Rs. 281250

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