notice how it just says 2.5billion but doesnt show you the thousands or hundreds. you may not have the exact amount needed so just be patient
And this is why number abbreviations annoy me in games like these. Sure, they're easier to read than 2,512,874,159 or whatever exact number we're talking here, and less screen space is needed for really large numbers into the quadrillion and higher, but when a price is listed as something like "2.5 billion", you're going to read that as "2.5 billion, exactly, and not a fraction more." Any fractions above that should be printed or else the player might be confused and delayed.