Very basic stock-flow diagram of simple interest with table and graph output in interest, bank account and savings development per year. Initial deposit, interest rate, yearly deposit and withdrawal, and initial balance bank account can all be modified.
I have developed a lesson plan in which students work on both simple and compound interest across both IM and Excel. I also wrote an article about this in Dutch, which you can translate using for example Google Translate: https://docs.google.com/document/d/1SsyJF89jT8xwAmtDaMS0rfdUefW7pPwBnw4ASauVeFw/edit?usp=sharing