A can build a wall in 12 days, C can build the same wall in 20 days, but B can destroy it in 15 days. If they all work simultaneously, in how many days will the wall be completely built?
Options:
- A: 10 days
- B: 12 days
- C: 15 days
- D: 20 days
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- A sum of ₹4000 is invested at compound interest for 2 years at a rate of 10% per annum. What will be the total amount at the end of 2 years?
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- The difference between the compound interest and simple interest on a certain sum of money for 2 years at 5% per annum is ₹25. Find the sum.
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