Answer:
$61.87
Step-by-step explanation:
You want to know the amount to principal of a payment of $80 on a balance of $1500 if the APR is 14.5%.
The interest due is found from ...
I = Prt
where P is the outstanding balance, r is the annual rate, and t = 1/12 = one month of a year.
I = $1500·0.145·1/12 = $18.125 ≈ $18.13
After the interest is paid, the remainder of the payment goes toward the principal:
$80 -18.13 = $61.87
The amount toward principal is $61.87.
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Additional comment
Paying $80 per month, it will take 22 months to pay off the balance. You will have paid about $212 in interest.