No payments were made on a $3500 loan during its three-year term. What was the annually compounded nominal interest rate on the loan if the amount owed at the end of the term was $4298.73? (Round your answer to two decimal places.)

P = Po(1+r)^n = 4298.73.

Po = $3500.
n = 1comp./yr. * 3yrs = 3 Compounding periods.

3500(1*r)^3 = 4298.73,
(1+r)^3 = 4298.73/3500 = 1.228,
Take cube root of both sides:
1+r = 1.071, r = 0.07/yr.