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So, for example, 1.5 plus 5 Ticks is 1.55, whilst 2 plus 5 Ticks
is 2.1 and 10 plus 5 Ticks is 12.5.
To demonstrate this, we've made this calculator which will add or
subtract Ticks to Prices.
Sometimes in their Bots, customers don't want to add or subtract
Ticks, rather they want to add or subtract a Percentage.
This isn't quite as straighforward as it seems. For example 5.0
plus 100% isn't, as you might expect, 10, but is actually 9.0 (it
helps to think in terms of old fashioned fractional prices, e.g
4/1 plus 100% is, pretty obviously 8/1 not 9/1.
The formala we use is NewPrice = 1 + (( OldPrice - 1) * Percent
/ 100), e.g
1 + ((5 - 1) * 200/100) = 1 + (4 * 2) = 9
but even then you haven't finished because you next have to find
the actual 'Betfair Price' that the percentage approximates to:
for example 4 + 33% = 1 + ((4 - 1) * 133/100) = 4.99, so we need
to round up to 5.0 to get a 'Betfair Price'
... so we've added a Percentages calculator, to demonstrate the
difference between adding/subtracting Ticks and adding/subtracting
Percentages.
We've also added calculators for Equalising Profit/Loss if you've
Backed To Lay or Layed to Back.
If you find the calculator useful and would like it on your computer
you can download it here: 
calculator.zip (147 Kb).
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