Bill 1800 (1+.034)3 After 3 years
Sue 2300 (1+.024)3 Edit: this will be the amount in the account after 3 years....subtract original amounts to get interst earned !!
Bill's interst if rate changes 1800(1.034)2 (1.04)1 - 1800 = .....
Sue's interst was 2300(1.024)3 - 2300 =.....