Answer:
I think its 0.007 but I'm not sure or its 0.01
The factors of 36 are:
1,2,3,4,6,9,12,18,36.
Since the events are independent and can be reduced to two outcomes, we can solve it using the binomial formula.
$9,900
10% off of 10,000 is 9,000
10% more than 9,000 is 9,900
Yi forgot two factors of 63, which are 3 and 21.
This would make the greatest common factor 21.