Answer :

You have already wrote it in a decimal unless you were talking about a fraction because the fraction is 279/1000.
AL2006

That's not the question in the picture.

The question in the picture is " 27.9 percent ", to be written
as a decimal.

Whenever you see a percent sign, it means " /100 ".

27.9%  means  27.9/100 .

When you want to divide something by 100, you can just move
the decimal point two places to the left.

So  27.9 / 100  is just  0.279 .