Based on the information given the amount that was in the fund to begin with is $22.8 billion.
Using this formula
Fund amount=Credit unions amount paid/Reserve fund percentage
Where:
Credit unions amount paid=$1.92 billion
Reserve fund percentage=8.42% or 0.0842
Let plug in the formula
Fund amount=$1.92 billion/0.0842
Fund amount=$22.8 billion
Inconclusion the amount that was in the fund to begin with is $22.8 billion.
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