Gogarth (Mar/June 2021)

Hello,

I`m struggling with understanding the computation related to the no of contracts for currency futures.
While I was expecting that the no of futures contracts to be computed using September futures price of 0,2378 (because this is the current Sept future price), I see in the Answers that the no of futures contracts is computed based on the lock-in rate (which is the futures price valid @31st August).
My understanding from the AFM OT Lectures was that lock-in rate will be used when computing the result of closure of the futures deal.

Many thanks!
Andreea