| Step 1 |
Click on the  select button in the toolbar. |
| Step 2 |
Assign an initial value for the compartment.
- Click on the compartment labelled account
- Enter the value 300 into the equation bar
- Click on the
 tick mark
|
| Step 3 |
Add the equation for calculating interest.
- Click on the flow labelled interest
- Variables account and interest_rate are now listed as influences upon interest. These influences are visible by clicking on the
 inputs button. Selecting an influence from the drop-down list, places the text in the equation bar.
- Enter the expression account*interest_rate into the equation bar, either by selecting each variable in turn or by typing. Be sure to use an underscore rather than a space in interest_rate..
- Click on the tick mark
|
| Step 4 |
Assign a value for the withdrawal flow.
- Click on the withdrawal flow
- Enter the value 10 in the equation bar
- Click on the tick mark
|
| Step 5 |
Assign a value for interest rate.
- Click on the variable interest rate
- Enter the value 0.1 in the equation bar
- Click on the tick mark
|
