Explanation:
Shirley:-
Savings account balance after 35 years of CHRISTIE = 2000×(1.08)^35
= $31570.688
Shawn:-
Savings account balance after 25 years of Shawn = 2000 + 2000×(1.08)^34
= 2000 + 27380.2672
=$29380.2672
the difference in their savings account balances at the end of 35 years = $31570.6885 - $29380.2672
= $2190.4212