Answer:
a. both go down
b. both go down
c. payment goes down; total cost goes up.
Step-by-step explanation:
When the rate goes down, the payment and total paid both go down.
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When a down payment is made, the loan value goes down, so the payment and total paid both go down.
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When the loan period increases, the principal is borrowed for a longer period, so the total interest goes up. When payback occurs over a longer period, the payment amount goes down
The payment goes down, but the total paid goes up.