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Sohan borrows money on compound interest and returns it in two equal half - yearly instalments of $\text{Rs. 4,410}$ each. Find the interest charged if the rate of interest is $10 \%$ p.a. compounded half-yearly.

1. $\text{Rs. 630}$
2. $\text{Rs. 620}$
3. $\text{Rs. 640}$
4. $\text{Rs. 680}$

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