Can you imagine the horrible math if it went off any potential kickstarter percentages? Frankly I am lost after 20 on any scale. Seriously how do you people do numbers after you run out of fingers & toes?!?
it depends on how kickstarter calcs its cut, but in the simplest case it would be
[summed kickstarter pledges so far] * 0.9 = sum to be taken for stretch goals