A math question

Jessica borrowed $1500 from her credit union on a demand loan on August 16. interest on the loan, calculated on the unpaid balance, is charged to her account on the 1st of each month. jessica made a payment of $300 on september 17, a payment of $500 on october 7, a payment of $400 on november 12 and repaid the balance on December 15. The rate of interest on the loan on August 16 was 12% per annum. The rate was changed to 11.5% on september 25 and 12.5 on november 20. calculate the interest payment required and the total interest paid, using exact time/exact interest.
Asked Jan 24, 2016

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