Southern Bank has two types of account. Both accounts pay compound interest.

Everyday saver account:
Interest
2.4% per annum

1234 account:
Interest
3.4% per annum

Sue invests £2300 in the saver account.
Bill invests £1800 in the 1234 account.

a) Work out how much interest Sue and Bill each get after 3 years.
Sue:
Bill:

b) If the interest for the 1234 account changes to 4% in the 3rd year,
who will get the most interest after 3 years, Sue or Bill?
(THE ANSWER TO THIS IS 'Bill', I put it in just in case someone
else wanted to know)