For an n-year mortgage with $30,000 annual repayment and 4% annual effective interest, the interest portion for the 7th repayment was $8,922. Calculate the principal amount of the 7th repayment. Round the answer to the nearest dollar. D Question 11 (Continued from the last question.) Calculate the principal amount of the 10th repayment Round the answer to the nearest dollar Question 12 (Continued from the last question.) Calculate the interest amount for the 10th repayment. Round the answer to the nearest dollar