Shawn Bixby borrowed $36,000 on a 120-day, 12% note. After 65 days, Shawn paid $3,900 on the note. On day 95, Shawn paid an additional $5,900. Use ordinary interest. a. Determine the total interest use the U.S. Rule. (Do not round intermediate calculations. Round your answer to the nearest cent.)

b. Determine the ending balance due use the U.S. Rule. (Do not round intermediate calculations. Round your answer to the nearest cent.)