You actually Buy No when Sell Yes is 112 or greater.
Sorry major correction you buy the same number of shares not same dollar amount lulz.
Here's the math from a minute ago
Trump Sell Yes - 71
Rubio Sell Yes - 38
Cruz Sell Yes - 5
100 Shares of Trump = $29.00
100 Shares of Rubio = $62.00
100 Shares of Cruz = $95.00
Let's say Trump Wins
-$29.00 on Trump
+$38.00 on Rubio
+$5.00 on Cruz
$43.00 of Profit - $4.30 in Fees - $29.00 Loss = $9.70 WOOHOO
This actually happens fairly often in multi-way races.
Remember you can only bet $850 max per person per contract.