I think I've worked out where it's gone wrong which is I guess their question.


The rewards are calculated from the $200 level and then each prize down is 1/10 of that. But they have taken 1/10 of the previous prize in the table rather than calculating each individually from the $200 level which does affect rounding.



So here they have taken 0.00000005 /10 = 0.000000005 and rounded up to 0.00000001

Where they should have taken 0.00044450 / 100000 = 0.000000004445 rounds down to 0