math
posted by raza .
On the 1st of January 2014, Carol invested some money in a bank account.
The account pays 2.5% compound interest per year.
On the 1st of January 2015, Carol withdrew £1000 from the account.
On the 1st of January 2016, she had £23 517.60 in the account.
Work out how much Carol originally invested in the account?
PLEASE SHOW WORKING OUT. THANKYOU.

23360 someone else told me i dont know how