Savitri borrowed 10000 rupees from a bank for a period of two years at a fixed interest rate of 10% per annum, compounded semi-annually, and paid back 5025 rupees at the end of first year. Then, the…

The final payment is $6615$ rupees. After two half-year periods and the first payment, the balance is $10000(1.05)^2-5025=6000$ rupees. Two more half-year periods bring it to $6000(1.05)^2=6615$. Applying $10\%$ once to $6000$ gives $6600$ and misses the compounding within the year.