How many grams of KI are in 25.0 mL of a 3.0% (m/v) KI solution?
In your case, a
You know that the volume of the sample is four times smaller than this value, so you can say right from the start that it will contain four times less potassium iodide.
#25.0color(red)(cancel(color(black)("mL solution"))) * "3.0 g KI"/(100color(red)(cancel(color(black)("mL solution")))) = color(green)("0.75 g KI")#
The answer is rounded to two sig figs, the number of sig figs you have for the given concentration.