Answer: £29,791.00
Explanation:
Use the Equation

P represents principal which is the starting amount.
R represents rate which is the percent increase represented in decimal form.
N represents the number of times compounded per year.
T represents the total time.
The question is asking us to solve for A which is the total amount and we just have to plug in all the other variables given to us and solve and subtract from the original.
A = 90,000(1 + 0.1/1)^(1*3)
A = 90,000(1.1)^3
A = 119,791.00
We have the amount, and now we have to subtract it from the original.
119,791-90,000 = 29791