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The only relevant information you've discovered is as follows:
The COGS is $80,000.00.
Between the end of the initial year and the cash payment in the subsequent year, the value of the foreign currency had decreased in value by $2,000.00.
The buyer agreed to pay the current equivalent of $91,000.00 in his own currency.
At the end of the initial fiscal (accounting) year, the value of the foreign currency had decreased by $6,000.00.