200
It is 0.01
round to the first significant figure
It is then 30,000 rounded to 1 significant figure
Rounded to 1 significant figure it is 0.4
0.00009893 to 1 significant figure = 0.0001
200
It's already there.
7000
0.1
9000
2,000,000
10000000
It is 0.01
0.9
12
800
100