When a townmember, Frank, gets evicted from his home he finds a bond issued to his grandfather over 100 years ago. Andy realizes because it was an $100 bond with an 8.5% interest rate compounded annually, Frank might just be rich.
Fifty-three years ago, Jerry's Uncle Leo stiffed Jerry's mother out of $50. Eager to get it back, Jerry's father says, "Do you know what that's worth today in interest alone? $663.45, figured at a conservative 5% interest, compounded quarterly." Morty's calculations are almost accurate, though he does not compound quarterly, and his sum includes the principle, not just the interest.
Mr. Johnson from the Bank of Central Victoria talks to students about the importance of saving for key expenses and retirement. He writes out the compound interest formula to explain why they would have $727,000 in 25 years if they save 50 cents per week with the bank and the interest doubles their investment every 3 years.
Fry experiences the effects of compound interest on his savings. He started with 93 cents in his bank account 1,000 years ago, and it has had an average 2.25% interest rate over the 1,000 years. Fry learns that he is now a billionaire.
Charlie explains radiocarbon dating and how it is used to calculate the approximate age of an object. To make his explanation more concrete, he uses an analogy involving a refrigerator and the number of ice cubes in it.