Answer:
In order to find the answer, you must first find 15% of £200.
What I usually do, is make a small chart with 200 equaling 100%, and an unknown number being equal to 15%. Therefore it would look something like this:
200 100
? 15
Now, multiply 200 by whatever number is diagonally across to it, meaning the number 15.

Next, divide the product by whatever is across from 200, which means 100.

15% of 200 is 30
Now add 30 to original amount, which was £200, and you get your answer:

Your total is £230