4) Dora repaid her loan by paying $8,890 each year for 10 years. The interest rate on the loan was 4.6% per year. a) What was the principal amount she had borrowed? b) What was the total amount she paid on the loan? c) If she had borrowed $80,000 on the 10-year loan, what would have been her annual payments, if the interest rate on the loan was 4.6% per year? d) If she had borrowed $80,000 on a 4.6% interest rate loan, and paid $7,877 each year, how long will it take her to repay the loan