Rusty, Give up this pilot malarki, you should have been a maths teacher!
Of course, the other way to do it is to multiply the two factors together first (1.7 x 0.75 = 1.275) and then multiply the original £314 by the answer (314 x 1.275 = 400.35). However, like Alexjolly says, they won't be as hard as that; the numbers will work to give a nice round answer. Remember also, that this kind of question will be one of the last and also one of the hardest you are likely to get.
Don’t over think it; if you can multiply and divide and are confident with basic mathematical manipulation generally you won't have a problem.
Good Luck
Pre3