A demand loan of $8000 is repaid by payments of $3000 after 15 months, $4000 after 30

Question:

A demand loan of $8000 is repaid by payments of $3000 after 15 months, $4000 after 30 months, and a final payment after 4 years. If interest was 8% for the first two years and 9% for the remaining time, and compounding is quarterly, what is the size of the final payment?

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