Rs800 for 3 year at rate of 5 percent p. a

Simple Interest = (Time * Rate * Principal) / 100

=> SI = 3 * 5 * 800 / 100

=> SI = 15 * 8

=> SI = Rs. 150

Hence, her interest after 3 years at a rate of 5 percent = Rs. 150

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the best estimate is 3 because   8 can only go into 24 3 times

a≈380.13mi² would be your answer if the radius was 11 miles