Provisions – Unwinding of the discount

I attempted Example 1 – Discounting and provisions in CH 13 using instead the method laid out in the BPP text (the solution to Activity 1 in CH14 FYI). I calculated the initial Provision, and the Carrying Amount at the end of the year, with the balancing figure being the unwound discount. My answer differed to yours by a couple hundred, likely from rounding. All a long winded way to ask – is there a margin of error to account for different answers from rounding in the exam?