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7. The SI on a sum of money will be Rs.2500 after 5 years. In the next 5 years Principal is trebled, what will be the total interest at the end of the 10th year?

9. A certain amount of money amounts to Rs. 720 in 2 years and to Rs. 870 in 4(1/2) years. Find the rate of interest if S.I. is reckoned?

10. A statue of 550BC is priced at 15000 rupees. But a person wants instalment on the statue. So he gaves 10000 rupee cash and make an instalment of rupees 650 for 8 months. Find the rate of interest charged by the shopkeeper?