1.0
The Dewey Decimal Classification system organizes knowledge into 10 main classes. The range 000-099 covers Generalities, including topics such as encyclopedias, books about information, computer science, and the Dewey Decimal Classification itself.
000-099 = -99
.099 ton
79.642
4121
0.99 = 99/100
3
It is impossible to say without knowing what country you're asking about. There are several countries with a domestic telephone area code 099 or similar.
OV-099
.10
a man named stupid