Simple vs compound
Explore why simple: interest on original amount only.
In this lesson
Simple vs compound is part of Compound Interest Intro. This preview shows how interest-growth connects to everyday family decisions such as earning, saving, spending choices, goals, approvals, or parent-guided money conversations inside Progress Penguin.
Think about this money choice
Imagine this situation: Simple interest on 10000 in local currency at 10%/year after 3 years = 13000 in local currency. Compound interest (annually) after 3 years ≈ 13310 in local currency.
How it works
Simple: interest on original amount only. Compound: interest on principal + accumulated interest. Over time, compound interest grows exponentially while simple grows linearly.
Apply it to a real decision
Real-life money moment: You save 50000 in local currency for 10 years. Simple interest at 10%: total = 100000 in local currency. Compound interest (annual) at 10%: total = approximately 129687 in local currency.
Activity preview
Connect the ideas
Use the lesson to complete this short practice activity.
Build your own savings goal
Progress Penguin will guide you through the goal name, target amount, and deadline. When you finish, you will return to this exact lesson step.
Quiz preview
Compound interest differs from simple because:
Simple interest on 10000 in local currency at 10%/year after 3 years = 13000 in local currency. Compound interest (annually) after 3 years ≈ 13310 in local currency. What is the difference and where does it come from?