Gail decides to buy a Treasury note futures contract for delivery of $100,000 face amount in March, at a price of 130′5.

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Gail decides to buy a Treasury note futures contract for
delivery of $100,000 face amount in March, at a price of 130′5.5.
At the same time, Robert decides to sell a Treasury note futures
contract if he can get a price of 130′5.5 or higher. The exchange,
in turn, agrees to sell one Treasury note contract to Gail at
130′5.5 and to buy one contract from Robert at 130′5.5. The price
of the Treasury note increases to 130′15.0. Calculate Robert's
balance on margin account. Assume that initial margin is
$1,890.
My professor got (1,593.13) as the right
answer, but I got something
else