Answer:
The single decimal multiplier is 1.26.
Explanation:
Multipliers:
For a decrease of a%, we multiply by:

For a increase of a%, we multiply by:

For consecutive changes, we multiply the multipliers.
Increase of 5%
Multiply by

Increase of 20%
Multiply by

Consecutive:
1.05*1.2 = 1.26
The single decimal multiplier is 1.26.