Answer:
1) Simple interest is 72 dinars
2) Total amount after 3 years is 672 dinars.
Step-by-step explanation:
Principal Amount P = 600 dinars
Interest Rate= 4% = 0.04
Time = 3 years
i) Simple Interest
The formula used to calculate interest is 
Putting values and finding interest

So, simple interest is 72 dinars
ii) Total amount after 3 years
The formula to calculate total amount is: 
Putting values and finding future amount A

So, Total amount after 3 years is 672 dinars.