There's two different answers depending on part a.
If Part A is a "The answer is 1,000 to the nearest 10, calculate to the nearest 1" type question and you cannot calculate to the nearest 1, then use the 1,000 provided in part b. Most times this will be the type of question you see on parts that utilize previously calculated values.
If this is not the case and you are unsure how to calculate part a, then try your hardest to arrive at a value and use that value moving forward in part b. You will get penalized in part a for not calculating the correct value, but not in part b for using the incorrect value appropriately.
Hope this helps! Good luck!
