Find the amount and the compound interest on Rs. 2500 for 2 years at 10% per annum compounded annually.

7 Ravi purchased an old scooter for Rs. 12000 and spent Rs. 2850 on its overhanling. Then he sold it to his friend for Rs. 13860. How much percent did he gain or loss? 8 Find the compound interest on Rs. 25000 for 3 years at 6% per annum compounded annually. 10 Find the compound interest on Rs. 5000 for 1 year at 8% per annum compounded half-yearly. 11 Find the amount and the interest on Rs. 16000 for 3 years at 5% per annum compounded annually.