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Final answer:Usingsimple interest calculations, we find the total interest for note (a) is $9,000, the annual interest rate for note (b) is 8%, and the total interest for note (c) is $6,000.Explanation:The task given represents a simple interest calculation problem related to promissory notes. Here's how you calculate the missing information:Total Interestfor note (a) would be calculated using the formula: Principal x Rate x Time. So, $600,000 x 9/100 x 60/360 = $9,000.The maturity date for note (b) would be 30 days from July 2, which is August 1.The missingAnnual Interest Ratefor note (b) would be calculated by rearranging the simple interest formula to Rate = Total Interest / (Principal x Time); thus Rate = $600 / ($90,000 x 30/360) = 0.8 which is 8% when rounded to zero decimals.The maturity date for note (c) would be 6 months from March 7, which is September 7.TheTotal Interestfor note (c) is $120,000 x 10/100 x 180/360 = $6,000.Learn more about Simple Interest Calculation here:brainly.com/question/31814404#SPJ12...

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