回复：一道小學3年级数学题，3分钟之内答错了，证明你不适合玩基金！此题10人做9人错！

value before before the transaction:
$15 or $21 depends on how you look at it --- I would say it is $21 for it is the "market" value.

value after the transaction:
-$50

SO THE LOSS= -$50-$21 = -$71