Answer:
After 4 years, Leigh-Anne will have £ 2,813.77 in her account.
Explanation:
Given that Leigh-Anne invests £ 2500 for 4 years in a savings account, and she gets 3% per annum compound interest, to determine how much money does Leigh-Anne have at the end of 4 years, the following calculation must be performed: 
 
X = 2,500 x (1 + 0.03 / 1) ^ 4 
X = (2,500 x 1,003) ^ 4 
X = 2,813.77 
 
Thus, after 4 years, Leigh-Anne will have £ 2,813.77 in her account.