I don't understand what is wrong with my answers, it keeps on saying that my answers are wrong. Will give thumbs up to good response with good explanation

2-a. In transaction (b), what single sum amount must the company deposit on January 1 of this year? 2-b. What is the total amount of interest revenue that will be earned? Answer is complete but not entirely correct. Complete this question by entering your answers in the tabs below. What is the total amount of interest revenue that will be earned? Note: Round your intermediate calculations and final answer to nearest whole dollar. 2-a. In transaction (b), what single sum amount must the company deposit on January 1 of this year 2-b. What is the total amount of interest revenue that will be earned? Answer is complete but not entirely correct. Complete this question by entering your answers in the tabs below. In transaction (b), what single sum amount must the company deposit on January 1 of this year? Note: Round your answer to nearest whole dollar. Required information [The following information applies to the questions displayed below.] On January 1, Boston Company completed the following transactions (use a 7% annual interest rate for all transactions): (FV of $1, PV of $1, FVA of $1, and PVA of $1 ) Note: Use appropriate factor(s) from the tables provided. a. Promised to pay a fixed amount of $7,300 at the end of each year for eight years and a onetime payment of $117,600 at the end of the 8th year. b. Established a plant remodeling fund of $491,950 to be available at the end of Year 9. A single sum that will grow to $491,950 will be deposited on January 1 of this year. c. Agreed to pay a severance package to a discharged employee. The company will pay $76,300 at the end of the first year, $113,800 at the end of the second year, and $151,300 at the end of the third year. d. Purchased a $176,500 machine on January 1 of this year for $35,300 cash. A five-year note is signed for the balance. The note will be paid in five equal year-end payments starting on December 31 of this year