In fixed and floating odds winnings are a multiple of the price. E.g. a 5/1 win will pay out five times your stake (plus your stake).
In binary bets winnings/losses are calculated as follows:
When BUYING, Profit/Loss = The closing price minus the opening price times your bet size (per point).
When SELLING, Profit/Loss = The opening price minus the closing price times your bet size (per point).
The bet is that the Dow Jones will close up at the end of the day. The odds are 2/1. You bet with a stake of £25. The Dow does close up. The bet is then won. Your profits:
2 x £25 = £50 (plus your stake)
The bet is that "the Dow will close higher on the day". The price is 27-30. You BUY (agree with the proposition) at 30 for £5 per point. The Dow does close higher on the day, meaning that the bet makes up at 100. Therefore your winnings are:
(100 - 30) x £5 = £350
The same bet, that "the Dow will close higher on the day". The price is 27-30. You BUY (agree with the proposition) at 30 for £5 per point. The Dow does NOT close higher on the day, meaning that the bet makes up at 0. Therefore your winnings - or losses in this case - are:
(0 - 30) x £5 = -£150
The same bet, that "the Dow will close higher on the day". The price is 46-49. You SELL (disagree with the proposition) at 46 for £5 per point. The Dow does NOT close higher on the day, meaning that the bet makes up at 0. Therefore your winnings are:
(46 - 0) x £5 = £230
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