Answer:
Susie is correct. And Sammy rounded to the nearest thousand.
Explanation:
Susie rounded 39,090 to 39,000 because for thousands you round to the hundredth. And Sammy rounded the 90 to 1,000, but really it should have been rounded to the hundredth. Short story short Susie rounded right and Sammy got it wrong because he/she rounded the the nearest thousand not the hundredth.