Every Type of Interest Explained for School Kids

Interest isn't just "a percentage." It's the invisible force that either builds your wealth quietly for decades — or drains it without you noticing. Every savings account, every loan, every mortgage, every credit card, they all run on interest. But most people have no idea that there are 8 completely different types, each behaving in its own way. Some grow in a straight line. Some snowball exponentially. Some are locked in stone. Some shift beneath your feet without warning. This video breaks down every single type of interest from scratch, no assumed knowledge, just clear explanations with real numbers and simple analogies that make it all click. You'll learn: - Why simple interest grows in a straight line and compound interest grows like a snowball rolling downhill - How £1,000 at 7% becomes £3,800 with simple interest but £14,974 with compound interest over 40 years - The Rule of 72: divide 72 by the interest rate to know how fast your money doubles - How £10,000 invested at age 20 becomes £320,000 by age 65 without adding another penny - Why compound interest is your best friend when saving and your worst enemy when in debt - How homeowners who locked in fixed rates at 2% in 2021 were shielded when rates jumped to 5%+ - Why variable rate savings accounts quietly drop your rate after the introductory bonus expires - What AER actually means and why it is the only fair way to compare savings accounts - What APR actually means and why a loan with a lower headline rate can be more expensive than one with a higher rate - The difference between gross and net interest, and why what you earn on paper is not always what you keep - How the Personal Savings Allowance works and why ISAs make gross equal net - Why a higher rate taxpayer earning £2,000 and a basic rate taxpayer earning £1,500 can both end up keeping exactly £1,400 Whether you're revising for a finance exam or just want to finally understand how your money grows and how your debt compounds, this is