After a little debate on the formula to be used I wrote it up.
OK, if you know some algebra, you should try to do this yourself.
Otherwise, go to the next step.
Step 1: The formula.
quarter pounder = .25 lb (1/4 lb)
2.2 lb = 1 kg
"Royal with cheese"(1/4lb) = x kg
Now we put this information into an equation:
.25lb x 8.8 = 2.2lb = 1kg
All we do now is divide both sides of the equation by 8.8 because that is how you simplify an equation such as this.
(.25lb x8.8 = 1kg)/(8.8)
.25lb = .1136kg