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Given Principal $18,000, Interest Rate 9%, Time 240 days (useordinary interest) Partial payments: On 100th day, $7,600 On 180thday, $4,300a. Use the U.S. Rule to solve for totalinterest cost. (Use 360 days a year. Do not roundintermediate calculations. Round your answer tothe nearest cent.)Total interest cost $ b. Use the U.S. Rule to solve for balances.(Use 360 days a year. Do not round intermediatecalculations. Roundyour answer to the nearestcent.)On 100th dayOn 180th dayBalance after the payment$$c. Use the U.S. Rule to solve for final payment.(Use 360 days a year. Do not round intermediatecalculations. Roundyour answer to the nearestcent.)Final payment $
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