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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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