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The monthly payment on a 30 year $200,000 mortgage at 4.2% interest compounded monthly is $978.03. Let yn be the unpaid balance of the

The monthly payment on a 30 year $200,000 mortgage at 4.2% interest compounded monthly is $978.03. Let yn be the unpaid balance of the mortgage after n months. Solve the difference equation and find what the unpaid balance is after 15 years.

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