That is 525 million. The best way to figure this out is to expand the number. Two point one billion is two billion, one hundred million.
To check this out, remember that 500 million is half of a billion and therefore 1/4 of 2 billion. Likewise, 25 million times four is 100 million. Then adding those two results, you end up with 2.1 million again.
0.0952
10.5 billion.
0.3
0.1429
4
21
21
23.9524
One trillion divided by 250 billion is 4
25
15
25