Thanks alot Dave
<super late sneaky ninja edit>To add the 4% onto £17.65
multiply the amount by 1.xx
xx being the percentage. eg. 1.04 is 4 percent
So that's 17.65 x 1.04 = 18.36
But as i said it's 40p to every ten pound and 4p to every pound so that's 18 x 4, or 8 times 4 + 40.
You don't have to be spot on here, it's not like your life depends on it.
And yes i can do the maths on countdown