Hello, thank you for the solution. I do have a question for you about the solution you gave me for portion b). You got the DBO from beginning of the...

Hello, thank you for the solution. I do have a question for you about the solution you gave me for portion b). You got the DBO from beginning of the year as $2800 and end of the year DBO as $3645. How did you come up with those numbers? Thanks again