Umm, I usually work with American dollars, but I'll roll with it.
You want to find 41 percent of 860 and subtract it from 860.
Make a proportion:
x/860=41/100
Cross multiply:
860*41=35260
35260=100x
Divide both sides by 100 to get x alone.
x=352.60
Now, we are not done yet.
Subtract your value of x from 860
860-352.60=507.40
Your final answer: £507.40