Please answer these 2 questions. I have solved them and my answers were not correct. Please don't write down the answers I have written in bold font because they are not correct. I just included the wrong answers I came up so you can make sure your answers don't match to those. Thank you in advance!

1. A company buys a machine for $12,000, which it agrees to pay for in five equal annual payments, beginning one year after the date of purchase, at an annual interest rate of 4%. Immediately after the second payment, the terms are changed such that the company can pay off the loan immediately in a lump sum during the following year. What is the final single payment? (The answer is NOT $7,778 or $7,778.35 or $7,779)

2. Trevor needs a new computer for college. His uncle lends him $1,000 at 5 percent interest per year for 3 years. What is the total payment after 3 years if simple interest is used? [x] What is the total payment after 3 years if compound interest is used? [y] Write answers in the following form " 2345.00 ". Do not include $ and be sure to include two decimal places even if they are zeros. (x is NOT 1,150.00 and y is NOT 1,157.63)