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Step away from the compiler for a moment. Work with formulas on pencil and paper.

Suppose you have 1000 at 12% APR for 1 year (12 monthly payments)
Monthly payment is 88.85, right?

Then the...

Why would you expect that the numbers would change? You never decrease the loan amount or unpaid balance, so the same values print every time.

Another note: Why the do you print 12 payments? ...