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Answer :

Given:

Loan of $21,912

42 monthly payments of $931.

Find amount of interest.

First, find the total amount that Joni will pay.

[tex]42\times\$931=\$39,102[/tex]

Next, subtract the result by the amount of loan

[tex]\$39,102-$\$21,912=$\$17,190[/tex]

Therefore, Joni will pay $17,190 in interest.