how do i calculate the percentage towards a principal of a loan

Question

a student loan of $12000 at a fixed APR of 8% for 10 years

 

of the total amount paid, what percentage is paid toward the principal and what percentage is paid for interest?

Answer 1

How do I calculate $300 with an APR of 19.80?

Answer 2

(8.91+3.6)\0.69