Okay, here are the step-by-step solutions:
(a) To find the total interest earned:
* Lisa opened the account with $600.
* The interest rate is 4% annually.
* The account earns simple interest for 5 years.
So:
Interest rate = 4%
Principal amount = $600
Time = 5 years
Interest = (Interest rate) x (Principal amount) x (Time)
= (0.04) x ($600) x (5 years)
= $200
Therefore, the total interest earned is $200
(b) To find the total amount in the account (principal + interest):
Principal amount = $600
Interest earned = $200
Total amount = Principal amount + Interest earned
= $600 + $200
= $800
So the total amount in the account including interest is $800
Does this make sense? Let me know if you have any other questions!