LIRIO CO (MAR/JUN 16)

Good Day Sir,
In LIRIO CO, while calculating the lock in rate, in the futures hedging part of the question, what the examiner did is dividing 1 by the spot rate (1 by 1.1585).
What I did while solving was, I divided 1 by the Spot Average { (1.1585+1.1618)/2 }.

The Net Receipt in Examiner’s Answer is $23.12m whereas my answer is $23.13m.

Would any mark be deducted because of this discrepancy?

If yes, could you please be kind enough to explain the reason behind selecting 1.1585 and not 1.1618?