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the 차이 of two times a number and the number is eightThe 원둘레 of a circle is 18pi ft. What is the area, in square feet? Express your answer in terms of pipi.A pair of jeans is on sale for 20% off. The sale price is 55.00. What is the original amount of the pair of jeans?Nancy is investing 27,000 in an account paying 7.25% interest compounded weekly.What will Nancy's account balance be in 24 years?What is the original price of an item that costs 36 after a 20% discount?