This episode is all about the Intriguing Idea of Interest: No, not the 'I'm interested in some ice cream' interest but the money kind of interest, as told by a sparky girl struggling with her homework [groans] and her mother, who was also a banker. Here is the spreadsheet as mentioned in the episode that can show you more about how it works. https://docs.google.com/spreadsheets/d/1Td_122p3ON5NIFkwB_VvASnauVmIwiOo/edit?usp=share_link&ouid=101865209869282281432&rtpof=true&sd=true