Which of following indicates the correct numbering style between the following pairs?

4 out of every 100 licenses [a] OR four out of every 100 licenses [b]

The correct numbering style is [b] - four out of every 100 licenses.

The correct numbering style between the given pairs is as follows:

[a] 4 out of every 100 licenses would be written as "4 out of 100 licenses."

[b] Four out of every 100 licenses would be written as "Four out of 100 licenses."

The correct numbering style depends on whether the number is written as a numeral (4) or spelled out (four).